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<title>maildrop - mail delivery agent with filtering
abilities</title>
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<!-- Copyright 1998 - 2015 Double Precision, Inc. See COPYING for -->
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<h1>maildrop - mail delivery agent with filtering abilities</h1>
<p>Copyright 1998-2015, Double Precision Inc.</p>
<p>This program is distributed under the terms of the GNU General
Public License. See <code>COPYING</code> for additional
information.</p>
<h2>Introduction</h2>
<p><em>maildrop</em> is the mail filter/mail delivery agent
that's used by the <a href="http://www.courier-mta.org" target=
"_blank" shape="rect"><i>Courier</i> Mail Server</a>. You do not
need to download <em>maildrop</em> from here if you already have
the <i>Courier</i> mail server installed. This is a standalone
build of the <em>maildrop</em> mail filter that can be used with
other mail servers.</p>
<p><em>maildrop</em> is a replacement for your local mail
delivery agent. <em>maildrop</em> reads a mail message from
standard input, then delivers the message to your mailbox.
<em>maildrop</em> knows how to deliver mail to mbox-style
mailboxes, and maildirs. "maildir" is a mailbox format used by
the <i>Courier</i> mail server and <a href="http://www.qmail.org"
target="_blank" shape="rect">Qmail</a>.</p>
<p><em>maildrop</em> optionally reads instructions from a file,
which describe how to filter incoming mail. These instructions
can direct <em>maildrop</em> to deliver the message to an
alternate mailbox, or forward it somewhere else. Unlike procmail,
<em>maildrop</em> uses a structured filtering language.</p>
<p><em>maildrop</em> is written in C++, and is significantly
larger than procmail. However, it uses resources much more
efficiently. Unlike procmail, <em>maildrop</em> will not read a
10 megabyte mail message into memory. Large messages are saved in
a temporary file, and are filtered from the temporary file. If
the standard input to <em>maildrop</em> is a file, and not a
pipe, a temporary file will not be necessary.</p>
<p><em>maildrop</em> checks the mail delivery instruction syntax
from the filter file, before attempting to deliver a message.
Unlike procmail, if the filter file contains syntax errors,
<em>maildrop</em> terminates without delivering the message. The
user can fix the typo without causing any mail to be lost.</p>
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