3Com 3CR3MFA-92, User Manual

Page: 57 / 154

Pattern Based Message Filtering
57
Message Header Parameters
Spammers will typically enter false information into these fields and,
except for the Subject field, they are usually not useful in controlling
spam. These fields may be useful in whitelisting certain users or legitimate
source of email.
■
<<Mail Header>> — This parameter allows for a match on any part of
the message header.
■
<<Recipient>> — This parameter matches the To: or CC: fields.
■
CC:
■
From:
■
Message-ID:
■
Received:
■
Reply-to:
■
Sender:
■
Subject:
■
To:
Message Body Parameters
■
<<Raw Mail Body>> — This parameter allows for a match on any part
of the encoded message body. This encoded content includes Base64,
MIME, and HTML. Since messages are not decoded, a simple text
match may not work. Use <<Mail Content>> for text matching on the
decoded content.
■
<<Mail Content>> — This parameter allows for a match on the visible
decoded message body.
STA Token
STA tokens can also be selected for pattern based message filters. This
allows you to match patterns for common spam words that could be
hidden or disguised with fake or invisible HTML text comments that
would not be caught by a normal pattern filter. For example, STA extracts
the token "viagra" from the text "vi<spam>ag<spam>ra" and
"v.i.a.g.r.a.".