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Qmail

qmail is an Internet Mail Transfer Agent (MTA) for UNIX-like operating systems. It's a drop-in replacement for the Sendmail system provided with UNIX operating systems. qmail uses the Simple Mail Transfer Protocol (SMTP) to exchange messages with MTA's on other systems.

qmail was designed for high security. Sendmail has a long history of serious security problems.

If you need any qmail help, visit Qmail Support Forum or IRC channel #qmail on freenode.