User manual

- Redirect mail
The individual thresholds are:
1.
Spam Probability: None. Default: 0.
2.
Spam Probability: Low. Default: 0 - 9.
3.
Spam Probability: Medium. Default: 10 - 49.
4.
Spam Probability: High. Default: 50 -100.
The Low, Medium and High ranges can be adjusted with sliders and linked to
corresponding actions, which are then performed on all e-mails in that range. For spam
probability None, you can specify a subject extension.
In addition to effective spam filtering, an anti-spam solution must prevent the incorrect
classification of mail as spam (false positives) and use the available processing
resources efficiently in productive use. Mail is therefore checked using the definite
criteria before the combined criteria are applied, so that e-mails that can be definitively
classified as spam or non-spam are not subjected to further analysis. The exclusion
criteria prevent checking e-mails that can be definitely identified as non-spam, for
example through their sender.
Note: When a definite criterion applies, the spam probability is always 0 % or 100 %
and therefore falls into the probability range None or High, for which the
corresponding actions are performed.
Note: Of course, these criteria do not affect the execution of the remaining enabled
jobs, such as attachment checking by AntiVir. Thus, if you have enabled the definite
“No spam” criterion E-mails with attachments and set the threshold value
(Minimum number) to 2, this means only that the Spam Filtering job immediately
places these e-mails into the None spam probability range and not that a AntiVir job
will let those two attachments pass into your network unchecked.
Note: Normally you do not have to adapt the combined criteria. If your spam
detection rate is unsatisfactory, try optimizing the definite spam criteria (see below
for exclusion criteria).
5.4.1 Definite No-Spam Criteria
You can define the following exclusion criteria in the job:
Criterion Description
E-mails from these trusted senders (Whitelist) Whitelist: addresses of all known senders that are
always allowed and that are known not to send
spam. This normally includes all regular
communication partners as well as the domains of
your customers and suppliers. Keeping this list
up-to-date and comprehensive ensures that your
system resources will not be burdened with
unnecessary checking.
E-mails from Active Directory users All of the users and contacts included in the Active
Directory are regarded as trustworthy.
E-mails from User Whitelist entries The senders (address entries) included in the user
whitelist are delivered without prior checking for
spam.
Emails containing attachments E-mails with file attachments. Most unsolicited mail
does not contain attachments. You can optionally
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