The table below lists some of the predefined channels.
Table 13–1 Predefined Channels
Channel |
Definition |
|
---|---|---|
defaults |
Used to specify which keywords are defaults for various channels. See Configuring Channel Defaults. |
|
l |
UNIX only. Used to make routing decisions and for submitting mail using UNIX mail tools. |
|
ims-ms |
Delivers mail to the local store. |
|
native |
UNIX only. Delivers mail to /var/mail. (Note that Messaging Server does not support /var/mail access. User must use UNIX tools to access mail from the /var/mail store.) |
|
pipe |
Used to perform delivery via a site-supplied program or script. Commands executed by the pipe channel are controlled by the administrator via the imsimta program interface. |
|
reprocessprocess |
These channels are used for deferred, offline message processing. The reprocess channel is normally invisible as a source or destination channel; the process channel is visible like other MTA channels. |
|
defragment |
Provides the means to reassemble MIME fragmented messages. |
|
conversion |
Performs body-part-by-body-part conversions on messages flowing through the MTA. |
|
bitbucket |
Used for messages that need to be discarded. |
|
inactive/deleted |
Used to process messages for users who have been marked as inactive/deleted in the directory. Typically, bounces the message and returns custom bounce message to the sender of the message. |
|
hold |
Used to hold messages for users. For example, when a user is migrated from one mail server to another. |
|
sms |
Provides support for one-way email to an SMS gateway. |
|
|
Implements SMTP over TCP/IP. The multithreaded TCP SMTP channel includes a multithreaded SMTP server that runs under the control of the Dispatcher. Outgoing SMTP mail is processed by the channel program tcp_smtp_client, and runs as needed under the control of the Job Controller. tcp_local receives inbound messages from remote SMTP hosts. Depending on whether you use a smarthost/firewall configuration, either sends outbound messages directly to remote SMTP hosts or sends outbound messages to the smarthost/firewall system. tcp_intranet receives and sends messages within the intranet. tcp_auth is used as a switch channel for tcp_local; authenticated users switch to the tcp_auth channel to avoid relay-blocking restrictions. tcp_submit accepts message submissions—usually from user agents—on the reserved submission port 587 (see RFC 2476). tcp_tas is a special channel used by sites doing Unified Messaging. |