qpsmtpd is an Simple Mail Transfer Protocol Daemon (computer software) written in Perl. It was originally designed to be a drop-in replacement for qmail-smtpd , the SMTP component of qmail, and it is now also compatible with Postfix (software).

Its main purpose is to allow mail administrators to perform more advanced Spam (e-mail) filtering than is possible with other SMTP daemons.

The program s main author is Ask Bjørn Hansen.

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