I do not rewrite any headers and have 0 intention to do so as it break existing dkim and arc signatures. No modification except envelopes needed.
-- *Best Regards,* Dmitriy Alekseev DevOps Engineer On Sat, 19 Apr 2025, 13:10 Viktor Dukhovni via Postfix-users, < postfix-users@postfix.org> wrote: > On Sat, Apr 19, 2025 at 12:13:52PM +0200, Matus UHLAR - fantomas via > Postfix-users wrote: > > > On 18.04.25 22:00, Dmytro Alieksieiev via Postfix-users wrote: > > > So you say it's better to do recipient_canonical_maps on incoming mail? > > > How it will improve situation? SRS will still throw same error and > > > Postfix still reply with 4xx, no? > > > > canonical_maps apply when postfix receives mail. > > > > Using recipient_canonical_maps on postfix instance that receives mail > from > > the internet is fine - this way you can check for valid SRS address when > > receiving and can immediately refuse that mail. > > I recommend against "recipient_canonical_maps", it rewrites a subset of > the message headers, (To/Cc or Resent-To/Resent-Cc), while in almost all > cases one should really rewrite all address-valued headers or none. > > To rewrite envelope recipients, use "virtual_aliases", not > "recipient_canonical_maps". > > > Using sender_canonical_maps is better when you send mail to the > > internet, e.g. forward it - so mail recveived from internet will not > > have sender rewritten, but any mail forwarded from your system with > > remote sender address will. > > There is no dedicated equivaelnt mechanism to rewrite just envelope > senders on input, but the combination of: > > sender_canonical_classes = envelope_sender > sender_canonical_maps = ... > > is close enough. For header rewriting, use "canonical_maps", which > consistently rewrites all headers. > > -- > Viktor. > _______________________________________________ > Postfix-users mailing list -- postfix-users@postfix.org > To unsubscribe send an email to postfix-users-le...@postfix.org >
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