User`s guide

Friends list / Spammers list
Most people communicate regularly to a group of people or even receive messages
from companies or organizations in the same domain. By using friends or
spammers list, you can easily classify which people you want to receive e-mail
from (friends) no matter what the message contains, or which people you never
want to hear from again (spammers).
Note
We recommend that you add your friends' names and e-mail addresses to the Friends
list. Bitdefender does not block messages from those on the list; therefore, adding
friends helps ensure that legitimate messages get through.
Charset filter
Many spam messages are written in Cyrillic and / or Asian charsets. The Charset
Filter detects this kind of messages and tags them as SPAM.
Link filter
Almost all spam messages include links to various web locations. These locations
usually contain more advertising and the possibility to buy things, and, sometimes,
they are used for phishing.
Bitdefender maintains a database of such links. The Link filter checks every URL
link in a message against its database. If a match is made, the message is tagged
as SPAM.
Signatures filter
The Bitdefender spam researchers constantly analyze the spam e-mails in the wild
and release spam signatures to allow for their detection.
The Signatures filter checks e-mails against the spam signatures in the local
database. If a match is made, the message is tagged as SPAM.
Note
Unlike the other filters, the Signatures filter cannot be turned off independently of
the antispam protection.
NeuNet (Heuristic) Filter
The NeuNet (Heuristic) filter performs a set of tests on all the message
components, (i.e. not only the header but also the message body in either HTML or
text format), looking for words, phrases, links or other characteristics of SPAM. Based
on the results of the analysis, the e-mail will receive a spam score.
Antispam
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Bitdefender Internet Security 2013