Michael Grimm via Postfix-users:
> > Postfix has a "rule based language" for receiving mail, but there
> > is no such thing for outbound deliveries.
>
> I am only curious of how much functionality would be needed for
> that?
There is zero code, so that would be a lot of work. To give an
example, The SMTP server policy consists of a list of simple actions
(mostly allow or deny), and simple actions looked up in a table or
service. Changing delivery protocols is not a simple allow/deny action.
It might be more practical to temporarily defer hard rejects. That
would give a receiver multiple opportunities to receive your message.
The smtp_pix_workarounds are an example of time-dependent behavior
to work around buggy receivers.
Wietse
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