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

By the way, are you referring to non_smtpd_milters?

http://www.postfix.org/FILTER_README.html

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