Maildrop 2.0.3

maildrop is the mail filter/mail delivery agent thats used by the Courier Mail Server. You do not need to download maildrop from here if you already have Courier installed. This is a standalone build of the maildrop mail filter that can be used with other mail servers.
maildrop is a filter for local mail delivery agent. It reads the messages and redirects them to users mailbox.
maildrop optionally reads instructions from a file, which describe how to filter incoming mail. These instructions can direct maildrop to deliver the message to an alternate mailbox, or forward it somewhere else. Unlike procmail, maildrop uses a structured filtering language.
maildrop is written in C++, and is significantly larger than procmail. However, it uses resources much more efficiently. Unlike procmail, maildrop 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 maildrop is a file, and not a pipe, a temporary file will not be necessary.
maildrop 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, maildrop terminates without delivering the message. The user can fix the typo without causing any mail to be lost.
Enhancements:
- Messages delivered by maildrop will use the processs inherited umask.
- The -f option now allows an empty return address to be specified.
- The lockmail utility now drops any group-id privileges if the setgid bit was added to lockmails permissions.