Spam filter: Overview 

The Content Management spam filter evaluates the header and/or content of messages en route to the SMTP server(s). In particular, it will check the origin of messages to assess whether they are "spam," or unsolicited commercial email, by comparing the header information to a set of user-defined rules. Messages that are found to be spam can be deleted, archived or quarantined. Deleted or quarantined messages are not passed to the SMTP server for delivery.

See also:

Content filter: Overview