SOFTWIN Total Security 2011, RNW, DE, 5u, 1Y User's Guide download pdf (Page 98)

Note

Starting May 19, 2004, spam that contains sexually oriented material must include

the warning SEXUALLY-EXPLICIT: in the subject line or face fines for violations

of federal law.

Bayesian Filter

The Bayesian filter module classifies messages according to statistical information

regarding the rate at which specific words appear in messages classified SPAM as

compared to those declared NON-SPAM (by you or by the heuristic filter).

This means, for example, if a certain four-letter word is seen to appear more often

in SPAM, it is natural to assume there is an increased probability that the next

incoming message that includes it actually IS SPAM. All relevant words within a

message are taken into account. By synthesizing the statistical information, the

overall probability for the whole message to be SPAM is computed.

This module presents another interesting characteristic: it is trainable. It adapts

quickly to the type of messages received by a certain user, and stores information

about all. To function effectively, the filter must be trained, meaning, to be presented

with samples of SPAM and legitimate messages, much like a hound is primed to

trace a certain scent. Sometimes the filter must be corrected too - prompted to

adjust when it makes a wrong decision.

Important

You can correct the Bayesian filter using the Is Spam and Not Spam buttons

from the Antispam toolbar.

18.1.2. Antispam Operation

The BitDefender Antispam Engine uses all antispam filters combined to determine

whether a certain e-mail message should get into your Inbox or not.

Every e-mail that comes from the Internet is first checked with the Friends

list/Spammers list filter. If the sender's address is found in the Friends list the e-mail

is moved directly to your Inbox.

Otherwise, the Spammers list filter will take over the e-mail to verify if the sender's

address is on its list. If a match is made, the e-mail will be tagged as SPAM and

moved in the Spam folder.

Else, the Charset filter will check if the e-mail is written in Cyrillic or Asian characters.

If so the e-mail will be tagged as SPAM and moved in the Spam folder.

If the e-mail is not written in Asian or Cyrillic it will be passed to the Image filter.

The Image filter will detect all the e-mail messages containing attached images

with spam content.

Antispam

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SOFTWIN Total Security 2011, RNW, DE, 5u, 1Y User's Guide Page 98