On Tue, Nov 19, 2024 at 10:01:14PM +0100, Thomas Landauer via Postfix-users
wrote:
> when handing over incoming messages to an external command (i.e. a `pipe`
> delivery in `master.cf`), is it possible to keep the sender "on hold" in the
> SMTP session and then answer with 500 right away (if the external command
> returns 1), instead of answering with `250 2.0.0 Ok: queued as...` and
> sending a bounce?
As Wietse replied, NO. But, if your goal is to inspect and be able to
reject the message, then perhaps what you're looking for is either
an smtpd_proxy_filter or milter:
http://www.postfix.org/SMTPD_PROXY_README.html
http://www.postfix.org/MILTER_README.html
If either of these objects, then the sender will see a 5XX response, if
they don't reject the message, delivery proceeds normally, and you'd
ultimately hand off the message for mailbox storage to a delivery agent
that is less picky about its content.
--
Viktor.
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