Mail delivery failed: returning message to sender

Mail delivery failed: returning message to sender

Hello
I'm having this issue


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:

  example-email @integral-maintenance.com
    host mx.zoho.com [165.254.168.50]
    SMTP error from remote mail server after RCPT TO:<example-email @integral-maintenance.com >:
    552 5.1.1 <example-email @integral-maintenance.com > Mailbox delivery failure policy error