What is a Milter (mail filter)?


A milter or mail filter is a filter extension for SMTP server (mail transfer agents - MTA) that transforms a email message


It refers to a protocol and API for communicating mail traffic information between:

  • and mail filtering plug-in applications.

It was originally invented at Sendmail, Inc. but has also been adapted to other MTAs.

This protocol is used to inspect during a SMTP transaction:

It's used by:


1) 2)

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