Although the currently held belief is that Linux is immune to email viruses targeted at Microsoft Outlook users, it certainly makes no sense for UNIX mail servers to permit infected email to be sent through them. Although Ubuntu does not provide a virus scanner, one of the more popular of many such scanners is MailScanner, available from http://www.sng.ecs.soton.ac.uk/mailscanner/; a Ubuntu DEB package is available as well as the source code. It supports Sendmail and Exim, but not Postfix or Qmail. A hunt through synaptic using the search terms "virus" and "scanner" should yield some other options for you to try out.
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