ClamAV (www.clamav.net)??”An open source virus scanner that detects more than
20,000 viruses, worms, and Trojans. It uses a virus pattern database to identify viruses
and includes a program named freshclam that handles updating the database automatically.
Like SpamAssassin, ClamAV includes a daemon (clamd), a client (clamdscan),
and a second command-line tool that does not use the daemon (clamscan).
SpamAssassin (http://spamassassin.apache.org/)??”A spam-filtering program
written in Perl. It uses a large set of rules to help determine how ???spammy??? a message
looks and assigns a score based on the total of the rule values. For performance reasons,
SpamAssassin uses a background daemon called spamd to perform message analysis.
Access to this daemon is performed through the spamc client. A spamassassin command
that performs the analysis without using spamd is also installed but is not used by
either of the example configurations in this chapter.
Preparing Your System
You will need a few common items for the mail server configuration covered in this chapter, starting
with the proper hardware. A personal mail server can easily run on a Pentium-class computer,
although you may notice occasional slowdowns while incoming messages are being scanned.
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