fdm (fetch/filter and deliver mail) is a mail delivery agent and email filtering software for Unix-like operating systems, similar to fetchmail and procmail.

[2] fdm is available as a package in many Unix-like operating systems.

It has been included in OpenBSD ports since 2007-01-18.

[1] In 2014, the last maintainer of procmail posted a message to an OpenBSD mailing list himself suggesting that he removed the procmail port,[3] it had been suggested by a well-known OpenBSD ports maintainer that fdm is the natural alternative[4] (the procmail port,[5] however, had not been removed and remained in place as of 2020).

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