Thomas Landauer via Postfix-users:
> Hi,
>
> 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?
No. Receiving is decoupled from delivering. The only available
feedback from a Postfix delivery agent to a Postfix SMTP server is
through sender or recipient address verification.
This does not use any message content from the remote SMTP client.
Instead, it generates a new test message, sends the test message
envelope content, and discards the test message content.
Wietse
> As I understand it, every mail is handed over to Postfix'es `qmgr`,
> which works asynchronously/independently of the SMTP session - but maybe
> there's a way around this?
>
> Thanks!!
>
> --
> Cheers,
> Thomas
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