Dnia 25.10.2024 o godz. 19:52:09 Matus UHLAR - fantomas via mailop pisze:
>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 20:29, Jaroslaw Rafa via mailop wrote:
Never heard of actual HELO/rDNS matching, but it's quite common that servers
put various restrictions on HELOs, and reject names they consider to be
suspicious, for example "generic" names like
"ip-xxx-xxx-xxx-xxx.some-isp.com" (even if that name actually exists in the
DNS, and even if it matches rDNS).
This may cause the confusion. Restrictions like "must exist and not be
CNAME", "must not be generic-looking" are fine with RFC (and logical).
Requiring "hostname must poing back to sending IP" violates the RFC.
That's why I asked about the rDNS matching - I don't remember seeing such
server on the net yet.
--
Matus UHLAR - fantomas, uh...@fantomas.sk ; http://www.fantomas.sk/
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