On Wed, Apr 09, 2025 at 04:23:17PM +0200, Matus UHLAR - fantomas via 
Postfix-users wrote:

> > On 09/04/25 15:50, Viktor Dukhovni via Postfix-users wrote:
> > > You have a choice between running milters while the SMTP client is still
> > > waiting for a response, and therefore being able to reject some
> > > recipients or the entire message, and running milters *after* the
> > > message is accepted (a.k.a. "post-queue" content-inspection), which
> > > can happen after virtual alias rewriting has taken place.
> > > 
> > > Which if these do you want more, pre-queue (ability to return SMTP
> > > 5XX responses), or post-queue (ability to handle rewritten recipients)?
> 
> On 09.04.25 16:13, Gioele Pannetto via Postfix-users wrote:
> > For this use case a post-queue milter is more suitable.
> 
> Post-queue filter, not milter. Milter is pre-queue by definition.
> http://www.postfix.org/MILTER_README.html

No, that's not always the case...

-- 
    Viktor.
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