On Mon, Mar 24, 2025 at 6:31 AM Jeremy Harris <j...@wizmail.org> wrote:
> > In order to write a filter, I'd like an MTA which calls outgoing filters > after the whole RCPT TO series is done, but before DATA; having the list of > accepted recipients and the body already converted to what the receiver > needs. Dunno if any MTA currently does so. > > Depending on what you mean by "filter", Exim does. > > Both what it calls "transport filter" and outbound-side DKIM > processing/signing are applied during the outbound SMTP DATA phase. > > Obviously it also has things you might call "filter" that apply to > incoming messages. > Sendmail had, at the time I departed that project, the notion of an output filter that was applied inline during the transmission of a message to another MX. A search now for documentation about that comes up pretty thin though. Does it have to be outgoing? The open source stuff I did worked fine as an input filter. -MSK
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