Sun Java System Messaging Server 6 2005Q4 Administration Guide

Channel Keywords Categorized by Function

The following tables are categorized lists of keywords. The tables and categories are as follows:

Table 12–2 Address Handling Keywords
Table 12–3 Attachments and MIME Processing
Table 12–4 Character Sets and Eight Bit Data
Table 12–5 File Creation in the MTA Queue Area
Table 12–6 Header Keywords
Table 12–7 Incoming Channel Matching and Switching Keywords
Table 12–8 Logging and Debugging Channel Keywords
Table 12–9 Long Address Lists or Headers Channel Keywords
Table 12–10 Mailbox Filter Channel Keywords
Table 12–11 NO-SOLICIT SMTP Extension Support Keywords
Table 12–12 Notification and Postmaster Messages Keywords
Table 12–13 Processing Control and Job Submission Keywords
Table 12–14 Sensitivity Limit Keywords
Table 12–15 Keywords for Limits on Messages, User Quotas, Privileges, and Authentication Attempts
Table 12–16 SMTP Authentication, SASL and TLS Keywords
Table 12–17 SMTP Commands and Protocol Keywords
Table 12–18 TCP/IP Connection and DNS Lookup Support Keywords
Table 12–19 Miscellaneous Keywords

Table 12–2 Address Handling Keywords


Keyword	Page	Definition
Address Handling
733	Use % routing in the envelope; synonymous with `percents`. Address Types and Conventions
822	Address Types and Conventions Use source routes in the envelope; same as `sourceroute`.
addreturnpath	Generating of Return-path Header Lines Add `Return-path:` header to messages enqueued to this channel.
aliaslocal	Specifying Alias File and Alias Database Probes Look up rewritten addresses in the alias file and alias database.
authrewrite	TCP/IP Connection and DNS Lookup Support Used on a source channel to have the MTA propagate authenticated originator information, if available, into the headers.
bangoverpercent	Adding Routing Information in Addresses Group A!B%C as A!(B%C)
bangstyle	Address Types and Conventions Use UUCP ! routing in the envelope; synonymous with `uucp`.
defaulthost	Specifying a Host Name to Use When Correcting Incomplete Addresses Specify a domain name to use to complete addresses
dequeue_removeroute	Removing Source Routes Removes source routes from envelope `To:` addresses.
exproute	Adding Routing Information in Addresses Require explicit routing when addresses passed to remote systems.
holdlimit	Expansion of Multiple Addresses Hold message when number of envelope recipient addresses exceeds this limit.
improute	Adding Routing Information in Addresses Implicit routing for this channel’s addresses
missingrecipientpolicy	Legalizing Messages Without Recipient Header Lines Set policy for how to legalize (which header to add) messages that are lacking any recipient headers.
noaddreturnpath	Generating of Return-path Header Lines Do not add `Return-path:` header when enqueuing message.
nobangoverpercent	Adding Routing Information in Addresses Group A!B%C as (A!B)%C
nodefaulthost	Specifying a Host Name to Use When Correcting Incomplete Addresses Do not specify a domain name to use to complete addresses
noexproute	Adding Routing Information in Addresses No explicit routing for this channel’s addresses
noimproute	Adding Routing Information in Addresses No implicit routing for this channel’s addresses
noreceivedfrom	Constructing Received Header Lines from Envelope To and From Addresses Construct `Received:` header lines without including the original envelope From: address.
noremotehost	Specifying a Host Name to Use When Correcting Incomplete Addresses Use local host’s domain name as the default domain name to complete addresses
norestricted	Enabling Restricted Mailbox Encoding Same as `unsrestricted`.
noreverse	Enabling Channel-Specific Use of the Reverse Database Exempts addresses in messages from address reversal processing
norules	Enabling Channel-specific Rewrite Rules Checks Do not enforce channel-specific rewrite rule checks for this channel.
percentonly	Adding Routing Information in Addresses Ignores bang paths. Use % routing in the envelope.
percents	Address Types and Conventions Use % routing in the envelope; synonymous with `733`.
remotehost	Specifying a Host Name to Use When Correcting Incomplete Addresses Use remote host’s name as the default domain name to complete addresses
restricted	Enabling Restricted Mailbox Encoding The channel connects to mail systems that require encoding.
reverse	Enabling Channel-Specific Use of the Reverse Database Checked addresses against address reversal database or REVERSE mapping
routelocal	Disabling Rewriting of Explicit Routing Addresses Causes the MTA, when rewriting an address to the channel, to attempt to “short circuit” any explicit routing in the address.
rules	Enabling Channel-specific Rewrite Rules Checks Enforce channel-specific rewrite rule checks for this channel.
sourceroute	Address Types and Conventions Synonymous with `822`.
subaddressexact	Subaddress Handling Perform no special subaddress handling during entry matching; the entire mailbox, including the subaddress, must match an entry in order for the alias to be considered to match.
subaddressrelaxed	Subaddress Handling After looking for an exact match and then a match of the form name+*, the MTA should make one additional check for a match on just the name portion.
subaddresswild	Subaddress Handling After looking for an exact match including the entire subaddress, the MTA should next look for an entry of the form name+*.
unrestricted	Enabling Restricted Mailbox Encoding Tells the MTA not to perform RFC 1137 encoding and decoding.
uucp	Address Types and Conventions Use UUCP! routing in the envelope; synonymous with bangstyle.
viaaliasoptional	Specifying Address Must be from an Alias Final recipient addresses that match the channel are not required to be produced by an alias.
viaaliasrequired	Specifying Address Must be from an Alias Final recipient address that matches the channel must be produced by an alias.

Table 12–3 Attachments and MIME Processing


Keyword	Definition
defragment	Automatic Defragmentation of Message/Partial Messages Partial messages queued to the channel are placed in the defragmentation channel queue instead.
ignoreencoding	Ignoring the Encoding Header Line Ignore `Encoding:` header on incoming messages.
interpretencoding	Ignoring the Encoding Header Line Interpret `Encoding:` header on incoming messages, if the need arises.
nodefragment	Automatic Defragmentation of Message/Partial Messages Disables defragmention.

Table 12–4 Character Sets and Eigth Bit Data


Keyword	Definition
charset7	Character Set Labeling and Eight-Bit Data Default character set to associate with 7-bit text messages
charset8	Character Set Labeling and Eight-Bit Data Default character set to associate with 8-bit text messages
charsetesc	Character Set Labeling and Eight-Bit Data Default character set to associate with 7-bit text containing the escape character
eightbit	Character Set Labeling and Eight-Bit Data Channel supports eight-bit characters.
eightnegotiate	Character Set Labeling and Eight-Bit Data Channel should negotiate use of eight-bit transmission if possible.
eightstrict	Character Set Labeling and Eight-Bit Data Reject messages with headers that contain unnegotiated eight-bit data.
sevenbit	Character Set Labeling and Eight-Bit Data Do not support 8-bit characters; 8-bit characters must be encoded.

Table 12–5 File Creation in the MTA Queue Area


Keyword	Page	Definition
addrsperfile	Handling Mail Delivery to Over Quota Users Limit on the maximum number of recipients that can be associated with a single message file in a channel queue
expandchannel	Expansion of Multiple Addresses Specifies channel in which to perform deferred expansion due to application of expandlimit.
expandlimit	Expansion of Multiple Addresses Processes an incoming message “off-line” when the number of addressees exceeds this limit.
multiple	Handling Mail Delivery to Over Quota Users No limit on the number of recipients in a message file, however the SMTP channel defaults to 99.
single	Handling Mail Delivery to Over Quota Users A separate copy of the message will be created for each destination address on the channel.
single_sys	Handling Mail Delivery to Over Quota Users Create a single message copy for each destination system used.
subdirs	Spreading a Channel Message Queue Across Multiple Subdirectories Specifies the number of subdirectories across which to spread messages for the channel queues.

Table 12–6 Header Keywords


Keyword	Definition
authrewrite	TCP/IP Connection and DNS Lookup Support Used on a source channel to have the MTA propagate authenticated originator information, if available, into the headers.
commentinc	Handling Comments in Address Header Lines Leave comments in message header lines intact.
commentmap	Handling Comments in Address Header Lines Runs comment strings in message header lines through the `COMMENT_STRINGS` mapping table.
commentomit	Handling Comments in Address Header Lines Remove comments from message header lines.
commentstrip	Handling Comments in Address Header Lines Remove problematic characters from comment fields in message header lines.
commenttotal	Handling Comments in Address Header Lines Strip comments (material in parentheses) from all header lines, except Received: header lines. Not recommended.
datefour	Converting Date to Two- or Four-Digits Expand all year fields to four digits.
datetwo	Converting Date to Two- or Four-Digits Remove the leading two digits from four-digit dates. Provides compatibility with mail systems that require two digit dates; it should never be used for any other purpose.
dayofweek	Specifying Day of Week in Date Retain day of the week information and adds this information to date and time headers if it is missing.
defaulthost	Specifying a Host Name to Use When Correcting Incomplete Addresses Specify a domain name to use to complete addresses
dropblank	Stripping Illegal Blank Recipient Headers Strip illegal blank headers from incoming messages.
header_733	Address Types and Conventions Use % routing in the message header.
header_822	Address Types and Conventions Use source routes in the message header.
headerlabelalign	Header Alignment and Folding Controls the alignment point for message headers enqueued on this channel; it takes an integer-valued argument.
headerlinelength	Header Alignment and Folding Controls the length of header lines enqueued on this channel.
headerread	Removing Selected Message Header Lines Apply header trimming rules from an options file to the message headers upon message enqueue (use with caution) before the original message headers are processed.
headertrim	Removing Selected Message Header Lines Applies header trimming rules from an options file to the message headers after the original message headers are processed.
header_uucp	Address Types and Conventions Use ! routing in the header
inner	Rewriting Embedded Headers Parse messages and rewrite inner headers.
innertrim	Removing Selected Message Header Lines Apply header trimming rules from an options file to inner message headers (use with caution).
language	Setting Default Language in Headers Specifies the default language in headers.
maxheaderaddrs	Automatic Splitting of Long Header Lines Controls how many addresses can appear on a single line.
maxheaderchars	Automatic Splitting of Long Header Lines Controls how many characters can appear on a single line.
missingrecipientpolicy	Legalizing Messages Without Recipient Header Lines Set policy for how to legalize (which header to add) messages that are lacking any recipient headers.
nodayofweek	Specifying Day of Week in Date Removes day of the week from date and time headers. Provides compatibility with mail systems that cannot process this information; it should never be used for any other purpose.
nodefaulthost	Specifying a Host Name to Use When Correcting Incomplete Addresses Do not specify a domain name to use to complete addresses
nodropblank	Stripping Illegal Blank Recipient Headers Do not strip illegal blank headers from incoming messages.
noheaderread	Removing Selected Message Header Lines Do not apply header trimming rules from option file.
noheadertrim	Removing Selected Message Header Lines Do not apply header trimming rules from options file.
noinner	Rewriting Embedded Headers Do not to rewrite inner message header lines.
noinnertrim	Removing Selected Message Header Lines Do not apply header trimming to inner message headers.
noreceivedfor	Constructing Received Header Lines from Envelope To and From Addresses Construct `Received:` header lines without including any envelope recipient information.
noreceivedfrom	Constructing Received Header Lines from Envelope To and From Addresses Construct `Received:` header lines without including the original envelope From: address.
noremotehost	Specifying a Host Name to Use When Correcting Incomplete Addresses Use local host’s domain name as the default domain name to complete addresses
noreverse	Enabling Channel-Specific Use of the Reverse Database Exempts addresses in messages queued to the channel from address reversal processing
norules	Enabling Channel-specific Rewrite Rules Checks Do not enforce channel-specific rewrite rule checks for this channel.
nox_env_to	Generating/Removing X-Envelope-to Header Lines Remove `X-Envelope-to` header lines.
personalinc	Handling Personal Names in Address Header Lines Leave personal name fields in message header lines intact.
personalmap	Handling Personal Names in Address Header Lines Run personal names through PERSONAL_NAMES mapping table.
personalomit	Handling Personal Names in Address Header Lines Remove personal name fields from message header lines.
personalstrip	Handling Personal Names in Address Header Lines Strip problem characters from personal name fields in header lines.
receivedfor	Constructing Received Header Lines from Envelope To and From Addresses If a message is addressed to just one envelope recipient, to include that envelope `To:` address in the Received: header line it constructs.
receivedfrom	Constructing Received Header Lines from Envelope To and From Addresses Include the original envelope `From:` address when constructing a `Received:` header line for an incoming message if the MTA has changed the envelope `From:` address.
remotehost	Specifying a Host Name to Use When Correcting Incomplete Addresses Use remote host’s name as the default domain name to complete addresses
restricted	Enabling Restricted Mailbox Encoding Channel connects to mail systems that require this encoding.
reverse	Enabling Channel-Specific Use of the Reverse Database Check addresses against address reversal database or REVERSE mapping
rules	Enabling Channel-specific Rewrite Rules Checks Enforce channel-specific rewrite rule checks for this channel.
sensitivitycompanyconfidential	Sensitivity Checking `Companyconfidential` is the upper sensitivity limit of messages accepted.
sensitivitynormal	Sensitivity Checking `Normal` is the upper sensitivity limit of messages accepted.
sensitivitypersonal	Sensitivity Checking `Personal` is the upper sensitivity limit of messages accepted.
sensitivityprivate	Sensitivity Checking `Private` is the upper sensitivity limit of messages accepted.
sourcecommentinc	Handling Comments in Address Header Lines Leave comments in incoming message header lines.
sourcecommentmap	Handling Comments in Address Header Lines Runs comment strings in header lines through source channels.
sourcecommentomit	Handling Comments in Address Header Lines Remove comments from incoming message header lines, for example, To:, From:, and Cc: headers.
sourcecommentstrip	Handling Comments in Address Header Lines Remove problematic characters from comment field in incoming header lines.
sourcecommenttotal	Handling Comments in Address Header Lines Strip comments (material in parentheses) in incoming messages.
sourcepersonalinc	Handling Personal Names in Address Header Lines Leave personal names in incoming message header lines intact.
sourcepersonalmap	Handling Personal Names in Address Header Lines Run personal names through source channels.
sourcepersonalomit	Handling Personal Names in Address Header Lines Remove personal name fields from incoming message header lines.
sourcepersonalstrip	Handling Personal Names in Address Header Lines Strip problematic characters from personal name fields in incoming message header lines.
unrestricted	Enabling Restricted Mailbox Encoding Tells the MTA not to perform RFC 1137 encoding and decoding.
x_env_to	Generating/Removing X-Envelope-to Header Lines Enables generation of `X-Envelope-to` header lines.

Table 12–7 Incoming Channel Matching and Switching Keywords


Keyword	Definition
allowswitchchannel	Alternate Channels for Incoming Mail (Switch Channels) Allows switching to this channel from a `switchchannel` channel
nosaslswitchchannel	SMTP Authentication, SASL, and TLS No switching to this channel upon successful SASL authentication
noswitchchannel	Alternate Channels for Incoming Mail (Switch Channels) No channel switching should be done to or from the channel.
switchchannel	Alternate Channels for Incoming Mail (Switch Channels) Switches from the server channel to the channel associated with the originating host.
saslswitchchannel	SMTP Authentication, SASL, and TLS Cause incoming connections to be switched to a specified channel upon a client’s successful use of SASL.
tlsswitchchannel	Transport Layer Security Switches to another channel upon successful TLS negotiation.

Table 12–8 Logging and Debugging Channel Keywords


Keyword	Definition
logging	Logging Keywords Log message enqueues and dequeues into the log file and activates logging for a particular channel.
loopcheck	Setting Loopcheck Places a string into the SMTP EHLO response banner in order for the MTA to check if it is communicating with itself.
master_debug	Debugging Keywords Create debugging output in the channel’s master program output.
nologging	Logging Keywords Do not log message enqueues and dequeues into the log file.
noloopcheck	Setting Loopcheck No string into the SMTP EHLO response banner.
nomaster_debug	Debugging Keywords No debugging output in the channel’s master program output.
noslave_debug	Debugging Keywords Do not generate slave debugging output.
slave_debug	Debugging Keywords Generate slave debug output.

Table 12–9 Long Address Lists or Headers Channel Keywords


Keyword	Definition
expandchannel	Expansion of Multiple Addresses Specifies channel in which to perform deferred expansion due to application of expandlimit.
expandlimit	Expansion of Multiple Addresses Processes an incoming message “off-line” when the number of addressees exceeds this limit.
holdlimit	Expansion of Multiple Addresses Holds a message when the number of addresses exceeds this limit.
maxprocchars	Header Alignment and Folding Maximum length header that can be processed and rewritten.

Table 12–10 Mailbox Filter Channel Keywords


Keyword	Definition
channelfilter	Specifying Mailbox Filter File Location Location of channel filter file; same as `destinationfilter`.
destinationfilter	Location of channel filter file that applies to outgoing messages.
destinationspamfilterXoptin	Spam Filter Keywords Run messages destined to this channel through spam filtering software X.
fileinto	Specifying Mailbox Filter File Location Specify effect on address when a mailbox filter `fileinto` operation is applied.
filter	Specifying Mailbox Filter File Location Specify the location of user filter files.
nochannelfilter	Specifying Mailbox Filter File Location No channel filtering for outgoing messages. Also known as `nodestinationfilter`.
nodestinationfilter	Specifying Mailbox Filter File Location Do not perform channel filtering for outgoing messages.
nofileinto	Specifying Mailbox Filter File Location Mailbox filter fileinto operator has no effect.
nofilter	Specifying Mailbox Filter File Location Do not perform user mailbox filtering.
nosourcefilter	Specifying Mailbox Filter File Location Do not perform channel filtering for incoming messages.
sourcefilter	Specifying Mailbox Filter File Location Specify the location of channel filter file for incoming messages.
sourcespamfilterXoptin	Spam Filter Keywords Run messages originating from this channel through spam filtering software X.

Table 12–11 NO-SOLICIT SMTP Extension Support Keywords


Keyword	Definition
sourcenosolicit	NO-SOLICIT SMTP Extension Support Specifies a comma-separated list of solicitation field values that will be blocked in mail submitted by this channel.
destinationnosolicit	NO-SOLICIT SMTP Extension Support Specifies a comma-separated list of solicitation field values that will not be accepted in mail queued to this channel.

Table 12–12 Notification and Postmaster Messages Keywords


Keyword	Definition
(See page Controlling Delivery Status Notification Messages for complete notification procedures)
aliaspostmaster	Postmaster Returned Message Content Messages addressed to the user name postmaster at the official channel name are redirected to postmaster@local-host, where local-host is the local host name (the name on the local channel).
copysendpost	Returned Failed Messages Sends a copy of the failure notice to the postmaster unless the originator address on the failing message is blank.
copywarnpost	Warning Messages Sends a copy of the warning message to the postmaster unless the originator address on the undelivered message is blank.
errsendpost	Returned Failed Messages Sends a copy of the failure notice to the postmaster only when the notice cannot be returned to the originator.
errwarnpost	Warning Messages Sends a copy of the warning message to the postmaster when the notice cannot be returned to the originator.
includefinal	To Include Altered Addresses in Status Notification Messages Include final form of recipient address in delivery notifications.
nonurgentnotices	To Set Notification Message Delivery Intervals Specifies the amount of time that may elapse before notices are sent and messages returned for messages of non-urgent priority.
noreturnaddress	Postmaster Returned Message Content Use `RETURN_ADDRESS` option value as postmaster address name.
noreturnpersonal	Postmaster Returned Message Content Use `RETURN_PERSONAL` option value as postmaster personal name.
normalnotices	To Set Notification Message Delivery Intervals Specifies the amount of time that may elapse before notices are sent and messages returned for messages of normal priority.
nosendpost	Returned Failed Messages Disables sending a copy of all failed messages to the postmaster.
notices	To Set Notification Message Delivery Intervals Specifies the amount of time that may elapse before notices are sent and messages returned.
nowarnpost	Warning Messages Disables sending a copy of warning messages to the postmaster.
postheadbody	Postmaster Returned Message Content Returns both the headers and the contents of the message.
postheadonly	Postmaster Returned Message Content Returns only headers to the postmaster.
returnaddress	Postmaster Returned Message Content Specifies the return address for the local postmaster.
returnenvelope	Blank Envelope Return Addresses Control use of blank envelope return addresses.
returnpersonal	Postmaster Returned Message Content Set the personal name for the local postmaster.
sendpost	Returned Failed Messages Enables sending a copy of all failed messages to the postmaster.
suppressfinal	To Include Altered Addresses in Status Notification Messages Suppress the final address form from notification messages, if an original address form is present, from notification messages.
urgentnotices	To Set Notification Message Delivery Intervals Specify the amount of time which may elapse before notices are sent and messages returned for messages of urgent priority.
useintermediate	To Include Altered Addresses in Status Notification Messages Uses an intermediate form of the address produced after list expansion, but prior to user mailbox name generation.
warnpost	Warning Messages Enables sending a copy of warning messages to the postmaster.

Table 12–13 Processing Control and Job Submission Keywords


Keyword	Definition
(See Configuring Message Processing and Delivery for greater functional granularity)
backoff	Specifying the Retry Frequency for Messages that Failed Delivery Frequency of attempted redelivery of unsuccessfully delivered messages. Can be overridden by the keywords `normalbackoff`, `nonurgentbackoff`, `urgentbackoff`.
bidirectional	Setting Channel Directionality Channel served by a master and slave program.
deferred	Implementing Deferred Delivery Dates Recognize and honor of the `Deferred-delivery:` header line.
expandchannel	Expansion of Multiple Addresses Specifies channel in which to perform deferred expansion due to application of expandlimit.
expandlimit	Expansion of Multiple Addresses Processes an incoming message “off-line” when the number of addressees exceeds this limit.
filesperjob	Service Job Limits Number of queue entries to be processed by a single job.
immnonurgent	Implementing Deferred Delivery Dates Starts delivery immediately after submission for urgent, normal, and non-urgent messages.
master	Setting Channel Directionality Channel served by a master program (`master`).
maxjobs	Service Job Limits Maximum number of jobs that can be running concurrently for the channel.
nodeferred	Implementing Deferred Delivery Dates Specifies that `Deferred-delivery:` header line not be honored.
nonurgentbackoff	Specifying the Retry Frequency for Messages that Failed Delivery The frequency for attempted redelivery of nonurgent messages.
nonurgentblocklimit	Message Priority Based on Size Forces messages above this size to lower than nonurgent priority (second class priority), meaning that the messages will always wait for the next periodic job for further processing.
normalbackoff	Specifying the Retry Frequency for Messages that Failed Delivery The frequency for attempted redelivery of normal messages.
normalblocklimit	Message Priority Based on Size Forces messages above this size to nonurgent priority.
noservice	Enable Service Conversions Service conversions for messages coming into this channel must be enabled via `CHARSET-CONVERSION`.
pool	Processing Pools for Channel Execution Jobs Specifies a pool for a channel. Must be followed by the pool name to which delivery jobs for the current channel should be pooled.
service	Enable Service Conversions Unconditionally enables service conversions regardless of `CHARSET-CONVERSION` entry.
slave	Setting Channel Directionality Channel served by a slave program (slave).
threaddepth	SMTP Channel Threads Number of messages triggering new thread with multithreaded SMTP client.
transactionlimit	Limits the number of messages allowed per connection.
urgentbackoff	Specifying the Retry Frequency for Messages that Failed Delivery The frequency for attempted redelivery of urgent messages.
urgentblocklimit	Message Priority Based on Size Forces messages above this size to normal priority.
user	Pipe Channel Used on pipe channels to indicate under what user name to run.

Table 12–14 Sensitivity Limit Keywords


Keyword	Definition
sensitivitycompanyconfidential	Sensitivity Checking Upper sensitivity limit of messages accepted.
sensitivitynormal	Sensitivity Checking `Normal` is the upper sensitivity limit of messages accepted.
sensitivitypersonal	Sensitivity Checking `Personal` is the upper sensitivity limit of messages accepted.
sensitivityprivate	Sensitivity Checking `Private` is the upper sensitivity limit of messages accepted.

Table 12–15 Keywords for Limits on Messages, User Quotas, Privileges, and Authentication Attempts


Keyword	Definition
alternatechannel	Retargeting Messages Exceeding Limit on Size or Recipients Alternate destination channel for alternateblocklimit, alternatelinelimit, and alternaterecipientlimit
alternateblocklimit	Retargeting Messages Exceeding Limit on Size or Recipients Specifies limit on the number of blocks in a message before it will be sent to alternativechannel.
alternatelinelimit	Retargeting Messages Exceeding Limit on Size or Recipients Specifies limit on the number of lines in a message before it will be sent to alternativechannel.
alternaterecipientlimit	Retargeting Messages Exceeding Limit on Size or Recipients Specifies limit on the number of recipients in a message before it will be sent to alternativechannel.
blocklimit	Specifying Absolute Message Size Limits Maximum number of MTA blocks allowed per message.
disconnectbadauthlimit	Limits on Unsuccessful Authentication Attempts Limit on the number of unsuccessful authentication attempts that will be allowed in a session before the session is disconnected.
disconnectbadcommandlimit	Setting Session Limits Limits the number of session bad commands.
disconnectrecipientlimit	Setting Session Limits Limits the number of session recipients.
disconnectrejectlimit	Setting Session Limits Limits the number of rejected recipients.
disconnecttransactionlimit	Setting Session Limits Limits the number of transactions.
headerlimit	Limiting Header Size Limit on the maximum size of the primary (outermost) message header
holdexquota	Handling Mail Delivery to Over Quota Users Hold messages for users that are over quota.
holdlimit	Expansion of Multiple Addresses Holds an incoming message when the number of addresses exceeds this limit.
linelength	Imposing Message Line Length Restrictions Limits the maximum permissible message line length on a channel-by-channel basis.
linelimit	Specifying Absolute Message Size Limits Maximum number of lines allowed per message.
maxblocks	Automatic Fragmentation of Large Messages Specifies the maximum number of blocks allowed in a message.
maxlines	Automatic Fragmentation of Large Messages Specifies the maximum number of lines allowed in a message.
nameparameterlengthlimit	Controlling the Length of General and Filename Content-type and Content-disposition Parameters Controls the points at which the name content-type and filename content-disposition parameters are truncated.
noblocklimit	Specifying Absolute Message Size Limits No limit for the number of MTA blocks allowed per message.
noexquota	Handling Mail Delivery to Over Quota Users Return to originator any messages to users who are over quota.
nolinelimit	Specifying Absolute Message Size Limits No limit specified for the number of lines allowed per message.
nonurgentblocklimit	Message Priority Based on Size Forces messages above this size to lower than nonurgent priority (second class priority), meaning that the messages will always wait for the next periodic job for further processing.
normalblocklimit	Message Priority Based on Size Forces messages above this size to nonurgent priority.
parameterlengthlimit	Controlling the Length of General and Filename Content-type and Content-disposition Parameters Controls the points at which general content-type and content-disposition parameters are truncated.
recipientcutoff.	Limiting Message Recipients Rejects message if recipients exceed this value.
recipientlimit	Limiting Message Recipients Limits the number of recipient addresses that will be accepted for the message.
rejectsmtplonglines	Handling SMTP Mail with Lines Exceeding 1000 Characters Rejects messages that contain lines longer than 1000 characters (including CRLF).
sourceblocklimit	Specifying Absolute Message Size Limits Maximum number of MTA blocks allowed per incoming message.
truncatesmtplonglines	Handling SMTP Mail with Lines Exceeding 1000 Characters Truncate the line when it is over 1000 characters.
wrapsmtplonglines	Handling SMTP Mail with Lines Exceeding 1000 Characters Wrap the line when it is over 1000 characters.
urgentblocklimit	Message Priority Based on Size Forces messages above this size to normal priority.

Table 12–16 SMTP Authentication, SASL and TLS Keywords


Keyword	Definition
(See SMTP Authentication, SASL, and TLS for greater functional granularity)
authrewrite	TCP/IP Connection and DNS Lookup Support Used on a source channel to have the MTA propagate authenticated originator information, if available, into the headers.
maysaslserver	SMTP Authentication, SASL, and TLS Permit clients to attempt to use SASL authentication.
maytls	Transport Layer Security Causes the MTA to offer TLS to incoming connections and to attempt TLS upon outgoing connections.
maytlsclient	Transport Layer Security The MTA SMTP client will attempt TLS use when sending outgoing messages, if sending to an SMTP server that supports TLS.
maytlsserver	Transport Layer Security The MTA SMTP server will advertise support for the STARTTLS extension and will allow TLS use when receiving messages.
msexchange	Specifying Microsoft Exchange Gateway Channels Used on TCP/IP channels to tell the MTA that this is a channel that communicates with Microsoft Exchange gateways and clients.
mustsaslserver	SMTP Authentication, SASL, and TLS SMTP server does not accept messages unless remote client successfully authenticates.
musttls	Transport Layer Security Insist upon TLS in both outgoing and incoming connections.
musttlsclient	Transport Layer Security The MTA SMTP client will insist on TLS use when sending outgoing messages (the MTA will issue the STARTTLS command and that command must succeed).
musttlsserver	Transport Layer Security The MTA SMTP server will advertise support for the STARTTLS extension and will insist upon TLS use when receiving incoming messages.
nomsexchange	TCP/IP Connection and DNS Lookup Support Default.
nosasl	SMTP Authentication, SASL, and TLS SASL authentication is not permitted or attempted.
nosaslserver	SMTP Authentication, SASL, and TLS SASL authentication is not permitted.
notls	Transport Layer Security TLS will not be permitted or attempted.
notlsclient	Transport Layer Security TLS use will not be attempted by the MTA SMTP client on outgoing connections (the STARTTLS command will not be issued during outgoing connections).
notlsserver	Transport Layer Security TLS use will not be permitted by the MTA SMTP server on incoming connections (the STARTTLS extension will not be advertised by the SMTP server nor the command itself accepted).
saslswitchchannel	SMTP Authentication, SASL, and TLS Cause incoming connections to be switched to a specified channel upon a client’s successful use of SASL.
tlsswitchchannel	Transport Layer Security Cause incoming connections to be switched to a specified channel upon a client's successful TLS negotiation. It takes a required value, specifying the channel to which to switch.

Table 12–17 SMTP Commands and Protocol Keywords


Keyword	Definition
(See SMTP Command and Protocol Support for greater functional granularity)
allowetrn	ETRN Command Support Honors ETRN commands.
blocketrn	ETRN Command Support Blocks ETRN commands.
checkehlo	EHLO Command Support Checks the SMTP response banner to determine whether to use EHLO or HELO.
disableetrn	ETRN Command Support Disable support for the ETRN SMTP command.
domainetrn	ETRN Command Support Honors only those ETRN commands that specify a domain.
domainvrfy	VRFY Command Support Issues VRFY commands using a full address.
ehlo	EHLO Command Support Uses the SMTP EHLO command on initial connections.
eightbit	Character Set Labeling and Eight-Bit Data Channel supports eight-bit characters.
eightnegotiate	Character Set Labeling and Eight-Bit Data Channel should negotiate use of eight-bit transmission if possible.
eightstrict	Character Set Labeling and Eight-Bit Data Reject messages with headers that contain unnegotiated eight-bit data.
expnallow	EXPN Support Allows `EXPN` even if it has been disabled at the SMTP server level with the `DISABLE_EXPAND` SMTP channel option.
expndisable	EXPN Support Disables `EXPN` unconditionally.
expndefault	EXPN Support Allows `EXPN` if the SMTP server is set to allow it.
localvrfy	VRFY Command Support Issues VRFY commands using a local address.
mailfromdnsverify	DNS Domain Verification Verifies domain used on `MAIL FROM:` command exists in the DNS.
noehlo	EHLO Command Support Does not use the EHLO command.
nomailfromdnsverify	DNS Domain Verification Does not verify that the domain used on the `MAIL FROM:` command exists in the DNS.
nosendetrn	ETRN Command Support Does not send ETRN commands.
nosmtp	Channel Protocol Selection and Line Terminators Does not support the SMTP protocol. This is the default.
novrfy	VRFY Command Support Does not issue VRFY commands.
sendetrn	ETRN Command Support Sends ETRN commands.
sevenbit	Character Set Labeling and Eight-Bit Data Do not support 8-bit characters; 8-bit characters must be encoded.
silentetrn	ETRN Command Support Honors ETRN commands without echoing channel information.
smtp	Channel Protocol Selection and Line Terminators Supports the SMTP protocol. The keyword `smtp` is mandatory for all SMTP channels. (This keyword is equivalent to `smtp_crorlf`.)
smtp_cr	Channel Protocol Selection and Line Terminators Accepts lines terminated with a carriage return (CR) without a following line feed (LF).
smtp_crlf	Channel Protocol Selection and Line Terminators Lines must be terminated with a carriage return (CR) line feed (LF) sequence.
smtp_crorlf	Channel Protocol Selection and Line Terminators Lines may be terminated with any of a carriage return (CR), or a line feed (LF) sequence, or a full CRLF.
smtp_lf	Channel Protocol Selection and Line Terminators Accepts lines terminated with linefeed (LF) without preceding CR.
streaming	Protocol Streaming Controls the degree of protocol streaming used in the protocol associated with a channel.
vrfyallow	VRFY Command Support Provides informative responses to VRFY commands.
vrfydefault	VRFY Command Support Provides default responses to VRFY command, according to channel’s HIDE_VERIFY option setting.
vrfyhide	VRFY Command Support Provides obfuscatory responses to SMTP VRFY command.

Table 12–18 TCP/IP Connection and DNS Lookup Support Keywords


Keyword	Definition
TCP/IP Connection and DNS Lookup Support (See TCP/IP Connection and DNS Lookup Support for greater functional granularity)
cacheeverything	Caching for Channel Connection Information Caches all connection information.
cachefailures	Caching for Channel Connection Information Caches only connection failure information.
cachesuccesses	Caching for Channel Connection Information Caches only connection success information.
connectalias	Address Rewriting Upon Message Dequeue Deliver to whatever host is listed in the recipient address.
connectcanonical	Address Rewriting Upon Message Dequeue Connect to the host alias for the system to which the MTA would be connected.
daemon	Target Host Choice Connects to a specific host system regardless of the envelope address.
defaultmx	TCP/IP MX Record Support Channel determines whether to do MX lookups from network.
defaultnameservers	Nameserver Lookups Consults TCP/IP stack’s choice of nameservers.
forwardcheckdelete	Reverse DNS Lookups If reverse DNS lookup performed, next performs a forward lookup on the returned name to check that the returned IP number matches the original; if not, deletes the name and use the IP address.
forwardchecknone	Reverse DNS Lookups Does not perform a forward lookup after a DNS reverse lookup.
forwardchecktag	Reverse DNS Lookups If a reverse DNS lookup has been performed, next performs a forward lookup on the returned name to check that the returned IP number matches the original; if not, tags the name with *.
identnone	IDENT Lookups No perform IDENT lookups; performs IP to hostname translation; includes both hostname and IP address in `Received:` header.
identnonelimited	IDENT Lookups No IDENT lookups; does perform IP to hostname translation, but does not use the hostname during channel switching; includes both hostname and IP address in `Received:` header.
identnonenumeric	IDENT Lookups Does not perform IDENT lookups or IP to hostname translation.
identnonesymbolic	IDENT Lookups Does not perform IDENT lookups; does perform IP to hostname translation; includes only the hostname in `Received:` header.
identtcp	IDENT Lookups Performs IDENT lookups on incoming SMTP connections and IP to hostname translation; include both hostname and IP address in `Received:` header
identtcplimited	IDENT Lookups Performs IDENT lookups on incoming SMTP connections and IP to hostname translation, but do not use the hostname during channel switching. Include hostname and IP address in `Received:` header.
indenttcpnumeric	IDENT Lookups Performs IDENT lookups on incoming SMTP connections, but does not perform IP to hostname translation.
identtcpsymbolic	IDENT Lookups Performs IDENT lookups on incoming SMTP connections and IP to hostname translation; includes only hostname in `Received:` header.
interfaceaddress	TCP/IP Port Number and Interface Address Binds to the specified TCP/IP interface address.
lastresort	Last Resort Host Specifies a last resort host.
mailfromdnsverify	DNS Domain Verification Verifies that the domain used on the `MAIL FROM:` command exists in the DNS.
mx	TCP/IP MX Record Support TCP/IP network and software supports MX records lookup.
nameservers	Nameserver Lookups Specifies a list of nameservers to consult rather than consulting the TCP/IP stack's own choice of nameservers; `nameservers` requires a space separated list of IP addresses for the nameservers.
nocache	Caching for Channel Connection Information Does not cache any connection information.
nomailfromdnsverify	DNS Domain Verification Does not verify that the domain used on the `MAIL FROM:` command exists in the DNS.
nomx	TCP/IP MX Record Support TCP/IP network does not support MX lookups.
nonrandomemx	TCP/IP MX Record Support Does MX lookups; does not randomize returned entries with equal precedence.
port	TCP/IP Port Number and Interface Address Specifies the default port number for SMTP connections. The standard port is 25.
randommx	TCP/IP MX Record Support Does MX lookups; randomizes returned entries with equal precedence.
single	Target Host Choice Specifies that a separate copy of the message should be created for each destination address on the channel.
single_sys	Target Host Choice Creates single copy of message for each destination system used.
threaddepth	SMTP Channel Threads Number of messages triggering new thread with multithreaded SMTP client.

Table 12–19 Miscellaneous Keywords


Keyword	Definition
deferralrejectlimit	Setting Limits on Bad `RCPT TO` Addresses Sets limit on the number of bad RCPT TO: addresses
dispositionchannel	Process Channel Overrides Overrides the process channel as the place to initially queue delivery status notifications (DSNs).
destinationfilter	Specifying Mailbox Filter File Location Used on general MTA channels to specify a channel-level filter to apply to outgoing messages.
filter	Specifying Mailbox Filter File Location Takes a required URL argument describing the filter file location
nodestinationfilter	Specifying Mailbox Filter File Location No channel mailbox filter is enabled for either direction of the channel.
nosourcefilter	Specifying Mailbox Filter File Location No channel mailbox filter is enabled for source channel.
nofilter	Specifying Mailbox Filter File Location The default and means that a user mailbox filters are not enabled for the channel.
notificationchannel	Process Channel Overrides Overrides the process channel as the place to initially queue message disposition notifications (MDNs).
sourcefilter	Specifying Mailbox Filter File Location Used on general MTA channels to specify a channel-level filter to apply to incoming messages
submit	Channel Operation Type Used to mark a channel as a submit-only channel.
user	Pipe Channel Used on pipe channels to indicate under what user name to run.