Fdm (mail agent)
fdm (mail agent)
A mail delivery agent and email filtering software
fdm (fetch/filter and deliver mail) is a program designed to fetch mail from POP3 or IMAP servers, or receive local mail from stdin, and deliver it in various ways depending on a user-supplied ruleset. Mail may be filtered based on whether it matches a regexp, its size or age, or the output of a shell command. It can be rewritten by an external process, dropped, left on the server or delivered into maildirs, mboxes, to a file or pipe, or any combination.
fdm is designed to be lightweight but powerful, with a compact but clear configuration syntax. It is primarily designed for single-user uses but may also be configured to deliver mail in a multi-user setup. In this case, it uses privilege separation to minimize the amount of code running as the root user.
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