Background: CentOS 8, Postfix, Dovecot, Digital Ocean droplet.
My mail server can send and receive emails without a problem.
My DNS records include an
MX record for my mail server.
A mail.example.com directs to 10.10.10.1 AAAA mail.example.com directs to 1111:1111:1111:1111:1111:1111:1111 MX mail.example.com mail handled by mail.example.com
However when I tested my setup on MXtoolbox the MX Lookup test returned an error.
Category: MX Result: DNS Record not found
Question) Which record is missing or misconfigured? I'm not sure what to add or repair in this instance especially since emails can be sent and received.