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4.1. What Is Qmail-Scanner?

From the Qmail-Scanner website: "Qmail-Scanner is an addon that enables a qmail email server to scan all gateway-ed email for certain characteristics (i.e. a content scanner). It is typically used for its anti-virus protection functions, in which case it is used in conjunction with commercial virus scanners, but also enables a site (at a server/site level) to react to email that contains specific strings in particular headers, or particular attachment filenames or types (e.g. *.VBS attachments). It also can be used as an archiving tool for auditing or backup purposes. Qmail-Scanner is integrated into the mail server at a lower level than some other Unix-based virus scanners, resulting in better performance. It is capable of scanning not only locally sent/received email, but also email that crosses the server in a relay capacity."