Qmail-Scanner is an add-on that enables a Qmail email server to scan gatewayed email for certain characteristics (i.e. a content scanner). It is typically used for its anti-virus and anti-spam protection functions, in which case it is used in conjunction
Simscan is a simple program that enables qmail-smtpd to reject viruses, spam, and block attachments during the SMTP conversation so the email never makes it into your computers. It is completely open source and uses other open source components. Very effi