Site hospedado não recebe nem envia emails

sou novo no Digital ocean e tenho um área de hospedagem e minha área de email não recebe nem envia emails, fica dando erro This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed: all hosts for ‘’ have been failing for a long time (and retry time not reached) Reporting-MTA: dns;

Action: failed Final-Recipient: rfc822; Status: 5.0.0 o que pode ser?

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Hey friend!

It looks like SMTP may be blocked on your account. The best thing to do at this stage would be to open a ticket with our support team to request it’s removal.