Christophe Kalt via Postfix-users:
> Hi,
>
> The two options I've seen for implementing SRS are milter and
> [sender_]canonical_maps but it seems to me that neither are a good fit when
> rewriting the envelope From as they happen early on (smtpd and cleanup
> specifically) and before Postfix knows where the mail is going.
>
> That's a bit of a problem as rewriting the sender only makes sense if the
> mail is being sent over SMTP (and even then, it would be great to have more
> control as it is not always desirable). Looking for another option, the
> closest seems to be smtp_generic_maps except that it rewrites both envelope
> and header Froms.
>
> I suspect this could easily be adjusted with a new smtp_generic_classes
> parameter (similar to [sender_]canonical_classes) ?
This location in the message flow seems right to me. And we already
have an example for implementing an address rewriting _classes
feature. This can even be configured in master.cf if one also needs
to send messages with non-SRSed envelope.from, for example to
internal systems.
I won't have time for new code in the coming weeks. But if someone
can contribute then I'll look at it.
Wietse
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