On Tue, Aug 25, 2015 at 10:24:48AM -0400, Wietse Venema wrote:
> Hans Ginzel:
> > On Tue, Aug 25, 2015 at 09:51:50AM -0400, Wietse Venema wrote:
> > >Based on the tiny bits of information revealed sofar, I suggest
> > >using non_smtpd_milters.
> >
> > Thank you.
>
> If you need to rewrite headers in remote email, then you can achieve
> that with smtpd_milters.
>
> Milters receive the message content after Postfix has processed it,
> including From: and other headers that were added by Postfix itself.
It is also possible to introduce a "null" content-filter hop, and
then use either smtp_header_checks or header_checks via the
reinjection smtpd/cleanup service.
By a "null" content-filter I mean a configuration in which the
content_filter setting reinjects mail right back into Postfix (at
some loopback SMTP port othat than 25) without actually doing any
filtering (beyond smtp_header_checks and the like).
--
Viktor.
