On Mon, 2017-03-13 at 17:49 +0100, Andy Smith wrote:
I can see that the domain in question does have A and MX records,
possibly issues are that the A record doesn't match the PTR for the
IP returned by the A record and that one of the MX records doesn't
have a PTR. I'd be keen to know if one or both of these are the
issue, and what the situation WRT RFCs on email DNS says about what
are required for proper operation of email.
Martin,
On 13.03.17 18:08, Martin Gregorie wrote:
Does the domain have a PTR record for every A record and, by extension,
for every MX record? You should be able to check this with 'dig' or
simply use 'host' to verify that the relevant reverse lookups work OK.
no, he shoult not check that for any MX records.
No sane software does resolve MX and A/AAAA records to check their PTRs.
There's no sane reason one should have reverse DNS records on incoming mail
servers.
SA does not (and should not) do that.
PTR records (and matching A records) are required for outgoing mail, that's
all.
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