|This article relies on references to primary sources. (August 2011)|
|Original author(s)||Sam Varshavchik|
|Stable release||2.6.0 / 09-Sep-2012|
|Operating system||All POSIX (Linux, Mac OS X, FreeBSD, Solaris)|
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 has been suggested as an alternative to the unmaintained procmail MDA.
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. 
maildrop is written in C++ however it uses resources more 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.
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