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X-pstn-xfilter Header




X-pstn-xfilter Header
The x-pstn-xfilter header indicates that the message triggered a global pattern rule. The email protection service maintains a minimal number of these rules to ensure that certain messages that are quarantined as spam, regardless of the spam score.
One example of a global pattern rule is the presence of “ADV:” in the message subject line. The United States CAN-SPAM act mandates that any message with ADV: in the subject line should be considered an advertisement; even if the message doesn't score as spam, this global rule ensures that the message will be quarantined. Global pattern rules may occasionally be used as a method to respond quickly to new types of spam.
Example:
X-pstn-xfilter: yes
In this example, the X-pstn-xfilter is set to “yes” so the message was processed as junk mail.


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