In article <caaqnkjcpsnwd+vsrw2o9vtbz8nq2xwroh5rl5q8uqy5zcqg...@mail.gmail.com> 
you write:
>Might be better to have an MX record that points to localhost, because
>if you have an A record but no MX, people will just try to connect to
>the A record.

There's an RFC for that:

https://tools.ietf.org/html/rfc7505

R's,
John
-- 
Regards,
John Levine, jo...@iecc.com, Primary Perpetrator of "The Internet for Dummies",
Please consider the environment before reading this e-mail. https://jl.ly
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