373
OCR for images
Some SPAM mails use images to convey their message, so traditional text analysis will
fail. The character recognition tries to identify text in those images. Detecting typical
SPAM phrases, the SPAM score is increased by a basic value and a surcharge per
suspicious word.
In order to save system resources, the OCR won't be started if
the mail's SPAM score is sufficiently high.
English language indicates potential SPAM
The majority of SPAM mails is written in English language. Activate this switch to add
some points to the SPAM score of every English email. This will result in a significant
increase of the probability that the score of English mails will exceed the configured
SPAM filter thresholds.
Use "Userdefined SPAM checks" to change the score of
this setting. In the user administration you can even change
it individually for every local account. The rule ID is
"UNWANTED_LANGUAGE_BODY".
As this rather drastic measure affects all users, they all should
agree upon its activation.
Charsets from the Far East indicate potential SPAM
With this switch you can increase the SPAM score of every email which references
charsets of Japan, Korea, Thailand or China.
Kyrillic charsets indicate potential SPAM
With this switch you can increase the SPAM score of every Cyrillic email.
14.5.3-K
SPAM settings
The settings made on this screen will not only apply to the relay SPAM filter, but also
to the user specific SPAM filter as configured in the user administration.
