> On Nov 16, 2017, at 5:32 PM, Doug Hardie <bc...@lafn.org> wrote:
>
> I have a domain, say: aaa.com for which I receive mail. Currently I have A
> records in DNS for aaa.com and mail.aaa.com as well as a MX record for
> aaa.com. All three of them point to the same IP address which is where
> postfix is running. There is a political issue with the A record for aaa.com
> and it "needs" to be changed to elsewhere. I somehow seem to recall that
> there are some MTAs that do not use the MX records, but only check the A
> records.
Any MTA that fails to check MX records is badly broken, and can barely
deliver email to any domains that matter (all the big players have
MX hosts separate from their A/AAAA records used primarily for HTTP).
> Will changing the A record for aaa.com cause the loss of some incoming mail
No.
--
Viktor.
