General-Purpose Mail Filter
Mailfromd is a general-purpose mail filtering daemon and a
suite of accompanying utilities for
Postfix3 or any other MTA that
Pmilter) protocol. It is able
to filter both incoming and outgoing messages using a filter program,
written in mail filtering language (MFL). The daemon
interfaces with the MTA using
mailfromd can be thought of as an abbreviation for
‘Mail Filtering and Runtime
Modification’ Daemon, with an ‘o’ for itself.
Historically, it stemmed from the fact that the original
implementation was a simple filter implementing the sender
address verification technique. Since then the program has changed
dramatically, and now it is actually a language translator and
run-time evaluator providing a set of built-in and library functions
for filtering electronic mail.
The first part of this manual is an overview, describing the features
mailfromd offers in general.
The second part is a tutorial, which provides an introduction for
those who have not used
mailfromd previously. It moves from
topic to topic in a logical, progressive order, building on
information already explained. It offers only the principal information
needed to master basic practical usage of
omitting many subtleties.
The other parts are meant to be used as a reference for those who
mailfromd well enough, but need to look up some notions
from time to time. Each chapter presents everything that needs to be
said about a specific topic.
The manual assumes that the reader has a good knowledge of the
SMTP protocol and the mail transport system he uses
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