Mail delivery failed: returning message to sender

[rafael.martinez]

Good Morning

I have a dedicated server with CENTOS 7.9 and Cpanel/WHM v94.0.3 and when trying to send an email I receive the following bounce:

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:

  [email protected]
    host mail1.bravehost.com [65.39.211.20]
    SMTP error from remote mail server after RCPT TO:<[email protected]>:
    550 5.1.1 <[email protected]>: Recipient address rejected:
    User unknown in virtual mailbox table
Reporting-MTA: dns; xxx.myserver.xxx

Action: failed
Final-Recipient: rfc822;[email protected]
Status: 5.0.0
Remote-MTA: dns; mail1.bravehost.com
Diagnostic-Code: smtp; 550 5.1.1 <[email protected]>: Recipient address rejected: User unknown in virtual mailbox table

 

[cPRex]

Hey there! Usually when this happens this indicates a misconfiguration on the recipient's side and not an issue with your server. I would recommend checking the MX records for the domain with this command:

dig mx domain.com

and then see if that is routed properly. If you have another way to contact that email user you may want to let them know about this issue.