Am 25.10.2024 um 16:34:01 Uhr schrieb Tobias Fiebig via mailop:
The earlier message from Marco regarding FCrDNS is, in my opinion, not
100% correct; The host as FCrDNS (fafflords.co.uk IN A
217.155.145.43), and usually ehlo-matches-rdns is not enforced
(otherwise MS would also be in a bit of a bind ;-)). Still, I would
also strongly recommend matching ehlo, rdns, and forward dns.
On 25.10.24 16:59, Marco Moock via mailop wrote:
There are some servers out there that enforce DNS rdns matching
this is quite common.
and ehlo/helo hostname matching.
Never heard about this. It's also a RFC violation. The hostname in EHLO
must exist and be canonical name (thus not CNAME), but that's all.
I have also never heard about any server enforcing this - got an example of
such server?
On 25.10.24 17:25, Tobias Fiebig via mailop wrote:
There are some servers out there that enforce DNS rdns matching and
ehlo/helo hostname matching.
Yeah, and I am fully with you that this should be the default. ;-)
Sadly, there also is 'a rather large ESP' that considers EHLO matching
FCrDNS more of a 'suggestion'.
Because this is suggestion. The RFC explicitly says mail must not be
refused just because EHLO does not match FCrDNS.
--
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