Solve MX issues

wikipedia.org:
https://en.wikipedia.org/wiki/MX_record

Common failures:

  • The domain name itself is in MX:
    The mail server of e.g. shared hosting server, has a different name on it’s SSL certificate. And DANE would fail.
  • No SPF authorization of incoming mail server(s):
    The server itself takes care of incoming email. Plus an extra mailserver not to miss any incoming mail. Depending on mail server setup, SPF authorization may enable sending bounces.