AcceptMessagesOnlyFrom 

String 

A list of users who are allowed to send mail to this user 

AcceptMessagesOnlyFromDLMembers 

String 

A list of distribution groups whose members are allowed to send mail to this user 

Alias 

String 

Alias of the user 

AntispamBypassEnabled 

Boolean 

Specifies whether to skip anti-spam processing on this mailbox. (RecipientType UserMailbox only) 

CustomAttribute1 through CustomAttribute15 

String 

Attribute to store additional information. 

DeliverToMailboxAndForward 

Boolean 

Specifies whether messages sent to this mailbox will be forwarded to another address. (RecipientType UserMailbox only) 

DisplayName 

String 

The name that will be displayed in Microsoft Outlook 

DowngradeHighPriorityMessagesEnabled 

Boolean 

Prevents the mailbox from sending high priority messages. (RecipientType UserMailbox only) 

EmailAddress 

String 

SMTP mail address, cannot be used with PrimarySMTPAddress 

EmailAddresses 

String 

List of email addresses. Not to be used in conjunction with PrimarySmtpAddress or EmailAddressPolicyEnabled set to "True" 

EmailAddressPolicyEnabled 

Boolean 

Should be set to "True" as a default, will cause a primary email address to be generated for the user and will prohibit the use of 

- PrimarySmtpAddress 

- WindowsEmailAddress 

EndDateForRetentionHold 

Nullable 

The end date for retention hold for messaging records management (MRM) (RecipientType UserMailbox only) 

ExternalOofOptions 

String 

Sending an Out of Office message to external senders. Values limited to: "InternalOnly" or "External" (RecipientType UserMailbox only) 

ForwardingAddress 

String 

Address to forward mail to if DeliverToMailboxAndForward is set to "True" (RecipientType UserMailbox only) 

GrantSendOnBehalfTo 

String 

The distinguished name (DN) of other recipients that can send messages on behalf of this user 

HiddenFromAddressListsEnabled 

Boolean 

Hide the email address from address lists 

IssueWarningQuota 

Unlimited ByteQuantifiedSize 

The mailbox size at which to issue a quota warning. (RecipientType UserMailbox only) 

Languages 

String 

List of preference languages for display. (RecipientType UserMailbox only) 

MaxBlockedSenders 

Nullable 

The maximum number of senders that can be included in the blocked senders list. 

MaxReceiveSize 

Unlimited ByteQantifiedSize 

The maximum size of messages that this user can receive. 

MaxSafeSenders 

Nullable 

The maximum number of senders that can be included in the safe senders list. (RecipientType UserMailbox only) 

MaxSendSize 

Unlimited ByteQantifiedSize 

The maximum size of messages that this user can send. 

OfflineAddressBook 

String 

The associated address book. (RecipientType UserMailbox only) 

PrimarySmtpAddress 

String 

The address that external users will see when they receive a message from this user. Not to be used in conjunction with EmailAddresses: the EmailAddresses list contains the PrimarySmtpAddress. Can not be used with EmailAddressPolicyEnabled set to "True" 

ProhibitSendQuota 

Unlimited ByteQantifiedSize 

The mailbox size at which the user associated with this mailbox can no longer send messages. (RecipientType UserMailbox only) 

ProhibitSendReceiveQuota 

Unlimited ByteQantifiedSize 

The mailbox size at which the user associated with this mailbox can no longer send or receive messages. (RecipientType UserMailbox only) 

RecipientLimits 

Unlimited 

The maximum number of recipients per message to which this mailbox can send. 

RejectMessagesFrom 

String 

The recipients from whom messages will be rejected. 

RejectMessagesFromDLMembers 

String 

Messages from any member of these distribution lists will be rejected. 

RequireSenderAuthenticationEnabled 

Boolean 

Senders must be authenticated. 

RetainDeletedItemsFor 

String 

Timespan represented in a string form "dd.hh:mm:ss" specifying the length of time to keep the deleted items. (RecipientType UserMailbox only) 

RetainDeletedItemsUntilBackup 

Boolean 

Retain deleted items until the next backup. (RecipientType UserMailbox only) 

RetentionHoldEnabled 

Boolean 

Turn retention hold on or off (RecipientType UserMailbox only) 

RulesQuota 

ByteQuantifiedSize 

The limit for the size of rules for this mailbox. Maximum value is 256 KB (RecipientType UserMailbox only) 

SCLDeleteEnabled 

Nullable Boolean 

Delete messages that meet the SCL delete threshold (RecipientType UserMailbox only) 

SCLDeleteThreshold 

Nullable 

The Spam Confidence Level at which a mail will be deleted, allowed values: 0-9. (RecipientType UserMailbox only) 

SCLJunkEnabled 

Nullable Boolean 

Junk messages that meet the SCL junk threshold (RecipientType UserMailbox only) 

SCLJunkThreshold 

Nullable 

The Spam Confidence Level at which a mail will be marked as junk, allowed values: 0-9 (RecipientType UserMailbox only) 

SCLQuarantineEnabled 

Nullable Boolean 

Quarantine messages that meet the SCL quarantine threshold (RecipientType UserMailbox only) 

SCLQuarantineThreshold 

Nullable 

The Spam Confidence Level at which a mail will be quarantined, allowed values: 0-9 (RecipientType UserMailbox only) 

SCLRejectEnabled 

Nullable Boolean 

Reject messages that meet the SCL reject threshold (RecipientType UserMailbox only) 

SCLRejectThreshold 

Nullable 

The Spam Confidence Level at which a mail will be rejected, allowed values: 0-9 (RecipientType UserMailbox only) 

SimpleDisplayName 

String 

An ASCII only version of the DisplayName. 

StartDateForRetentionHold 

Nullable 

The start date for retention hold for MRM. (RecipientType UserMailbox only) 

UseDatabaseQuotaDefaults 

Boolean 

Specifies that this mailbox uses the quota attributes specified for the mailbox database where this mailbox resides. (RecipientType UserMailbox only) 

UseDatabaseRetentionDefaults 

Boolean 

Specifies that this mailbox uses the MailboxRetention attribute specified for the mailbox database where this mailbox resides. (RecipientType UserMailbox only) 

UserPrincipalName 

String 

This is the logon name for the user. The UPN consists of a user name and a suffix.