Avira antivir exchange User Manual
Anti-spam
129
Combined header criteria
Criterion
Description
Suspicious sender
properties
Checks whether the "From" header exists and contains an
entry and whether it matches the sender of the SMTP
protocol.
protocol.
Suspicious recipient
properties
Checks whether the "To" header exists and contains an entry
and whether at least one of the SMTP recipients is in the
"To" or "Cc" header.
"To" or "Cc" header.
Numbers in sender
address(es)
Checks whether one of the sender addresses (SMTP or email
header) contains numbers.
Number of recipients per
e-mail
Checks the number of recipients for an email.
Known spam X-Mailer
Checks whether the X-Mailer entry in the email is a known
spam mail client.
spam mail client.
Known spam results
Takes the result of a previous spam analysis for the
classification of emails as spam or no-spam into account.
The result (number of
The result (number of
spam indicators found) is written to
the
X-header of the email. Avira AntiVir Exchange
evaluates the X-header and writes the number of
spam
indicators to the criterion. The evaluation takes place using
the
the
minimum/maximum number of possible spam
indicators. The result may originate from an external system
or may have been calculated from the Avira AntiVir
Exchange of another server.
Exchange of another server.
Combined subject criteria
Criterion
Description
No subject
Checks whether the subject field exists and contains an
entry.
Recipient address in the
subject field
Checks whether the subject of the email contains the part of
the recipient address before the @.
Junk string in the subject
field
Checks whether long strings of hidden characters (spaces)
and meaningless junk strings occur in the subject of the
and meaningless junk strings occur in the subject of the
email.
Phrases in the subject field
Checks whether words from the typical spam vocabulary are
found in the subject field of the email.
found in the subject field of the email.
Disguised words in the
subject field
subject field
Checks whether disguised words from the specified
dictionary (dictionaries) are found in the subject field of the
email.
dictionary (dictionaries) are found in the subject field of the
email.