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2.2.4 Format of the Junk Email Rule

The Junk Email rule stores preferences regarding how spam filtering is applied.

The format of the preferences is a server-side extended rule that follows the Email Rules Protocol, as specified in [MS-OXORULE]. This format is convenient for a server that implements the Email Rules Protocol, because executing the rule (4) on a message will apply the spam filtering preferences to the message and move it to the Junk Email folder if it fits the condition for spam.

The restriction (2) that makes up the condition of the Junk Email rule, as specified in [MS-OXORULE] section 2.2.1.3.1.9, contains several interdependent clauses. These clauses are essentially lists of Simple Mail Transfer Protocol (SMTP) e-mail addresses and several categories of e-mail domains.

The clauses are listed in the following table.

Blocked sender addresses

E-mail addresses of senders (who the message was sent from) to be blocked

Blocked sender domains

E-mail domains of senders that can be blocked.

Trusted sender domains

E-mail domains of senders that are trusted.

Trusted recipient domains

E-mail domains of recipients (1) (who the message was sent to) that are trusted.

Trusted sender addresses

E-mail addresses of senders that can be trusted.

Trusted recipient addresses

E-mail addresses of recipients (1) that can be trusted.

Trusted contact addresses

E-mail addresses of contacts (3) from the mailboxContacts folder.

There is also a clause that checks the value of the PidTagContentFilterSpamConfidenceLevel property (section 2.2.1.3) in the event that this property was applied to the message during delivery.

For more details about executing the Junk Email rule on a message, see section 3.1.5.1.

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