On Tue, Nov 21, 2023 at 04:24:35PM +0100, Vincent Lefevre via Postfix-users
wrote:
> When sending a mail to some @helpdesk.inria.fr address, postfix tries
> to connect to helpdesk.inria.fr (which does not have a MX):
>
> Nov 21 15:43:26 joooj postfix/smtp[748304]: D1A104A9:
> to=<[...]@helpdesk.inria.fr>, relay=none, delay=76462,
> delays=76431/0.1/30/0, dsn=4.4.1, status=deferred (connect to
> helpdesk.inria.fr[128.93.128.88]:25: Connection timed out)
All correct and as expected.
> Some admin at Inria tells me that this is incorrect and that postfix
> should connect to the MX of the parent domain (inria.fr) in such a
> case.
Some admin at inria has no idea what he or she is talking about, and is
just inventing things out of thin air.
Only the MX (and in their absence the A and AAAA) of the recipient
domain are considered. The parent domain MUST NOT be used.
If "helpdesk.inria.fr" does not receive email (no MX RRs and no SMTP
server reachable at any A or AAAA RRs), then the email address in
question is unreachable.
--
Viktor.
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