The mechanism by which spam probabilities are calculated, and the actions associated with
probability thresholds, are described in the Tuning Spam Detection section.
- Tag and Deliver: Alter the "Subject" header of messages delivered to end
users, generally if the message's spam probability is over a certain "threshold".
For example, the default policy alters the Subject header if the message's spam
probability is greater than 50%. Users can implement filters within their email
client based on the subject line modification, as described in the End User Management
section of the Administrator's Reference.
-
Silently Tag and Deliver: Add a custom message header that records the spam
probability and the anti-spam rules that were triggered by the message. The default
policy adds an X-PerlMx-Spam header to all messages with a spam
probability. Custom headers are not visible in most client email programs.
- Quarantine: Quarantine messages with a spam probability greater than a
specified percentage, allowing administrators to review quarantined messages. It can
be used in conjunction with the options described above. By default, the PureMessage policy copies messages with a
probability of 50% or greater to the quarantine.
- Quarantine and Digest: Move messages above a certain probability to the
quarantine. Quarantine Digests inform users of which messages have been quarantined.