> On Feb 25, 2019, at 2:46 PM, Matus UHLAR - fantomas <uh...@fantomas.sk> wrote: > > Milter is BQCF. It processes the mail during scanning, and afaik its > functionality can replace both smtp_proxy and check_policy_service. > > And, you can do multiple milters. > It just can't modify mail body, only headers, but you usually don't need > this.
Milters can modify (replace) the message body. Milters operating in front of a pre-queue proxy filter can only see and modify the message envelope, and can neither see nor modify the message content (headers or body). -- Viktor.