On Fri, Oct 27, 2023, Marco M. via mailop wrote:
> Am 27.10.2023 um 15:19:33 Uhr schrieb Cyril - ImprovMX via mailop:
> > For instance, if my server has a PTR with mail1.example.com, and I
> > connect by saying "HELO send.example.com". If the receiving server
> > loads all the IPs for "send.example.com" but doesn't find my server's
> > IP, should it refuse the email or accept it ?
Accept the HELO command.
"PTR mismatch" usually refers to something else than checking the
HELO argument. For example, see the sendmail documentation:
${client_resolve}
Holds the result of the resolve call for
${client_name}. Possible values are:
OK resolved successfully
FAIL permanent lookup failure
FORGED forward lookup doesn't match reverse lookup
TEMP temporary lookup failure
Defined in the SMTP server only. sendmail per-
forms a hostname lookup on the IP address of the
connecting client. Next the IP addresses of that
hostname are looked up. If the client IP address
does not appear in that list, then the hostname
is maybe forged. This is reflected as the value
FORGED for ${client_resolve}
> Because the big companies enforce a correct PTR, almost all servers
> sending mail have a working PTR.
But not wrt the HELO argument, right?
--
Please don't Cc: me, use only the list for replies, even if the
mailing list software screws up the Reply-To header.
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