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Original author(s)Sam Varshavchik
Initial releasepre-1999
Stable release
2.9.0 / June 23, 2017; 2 years ago (2017-06-23)[1]
Preview release
20170724 / July 24, 2017; 2 years ago (2017-07-24)[1]
Operating systemAll POSIX (Linux, Mac OS X, FreeBSD, Solaris)
TypeMail filter

maildrop is a Mail delivery agent used by the Courier Mail Server. The maildrop MDA also includes filtering functionality. maildrop receives mail via stdin and delivers in both Maildir and mbox formats.


maildrop can optionally read filtering configuration from a file to determine whether the message is delivered to an alternate mailbox or forwarded. The structured filtering language is robust enough to allow maildrop to work with virtual mailboxes. If the filtering configuration contains syntax errors maildrop does not deliver the message but the message is not lost. [2]

maildrop is written in C++ however it uses resources less efficiently than procmail (written in C) by saving large messages to a temporary file rather than reading them into memory. If the input to maildrop is a file then a temporary file is not used.[3]


  1. ^ a b "latest releases". Package: maildrop subsection. Retrieved 4 August 2017.
  2. ^ "Maildrop features". Retrieved 7 July 2011.
  3. ^ "Maildrop features (efficiency)". Retrieved 7 July 2011.

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