On 2025/01/28 16:55, Fehlauer, Norbert via mailop wrote:
if a domain has no mx record than a fallback to A/AAAA for the domain is
possible. Is this fallback only to happen when no mx record exists for
the domain or can this fallback happen when no connection to the mx
defined servers is possible? I would "guess" that it only should happen
if there are no mx records at all. Can someone confirm this?
Correct, although I believe this behaviour should be deprecated.
On 28.01.25 17:17, Stuart Henderson via mailop wrote:
Yes that is what is supposed to happen.
Bugs (or I suppose unfortunate packet drops during queries) might result in
mail going to the A/AAAA even when there is an MX though.
Is there any kind of DNS error that could cause this?
Lost DNS reply or SERVFAIL should not.
MTA not following the RFC is different issue.
--
Matus UHLAR - fantomas, uh...@fantomas.sk ; http://www.fantomas.sk/
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