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)?
For this use case a post-queue milter is more suitable. By the way, are
you referring to non_smtpd_milters?
--
Gioele
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