Message Delivery Failure

Question

I got this bounce back. What does it mean and How do I solve it? Thanks.

MailEnable: Message Delivery Failure.
Reason: ME-E0193: [B7C2FA717C634859B59BCACF7D8C38A8.MAI] Message Delivery Failure.

Your message addressed to the target domain could not be delivered because
the mail server responsible for this domain returned a permanent error.

The server returned: 554 5.7.1 Delivery not authorized

Answer 1

It probably means that a spam filter blocked the mail.

Try to send the same mail from a email webservice and see if you encounter the same error.