Mail delivery failed: returning message to sender

[wilsonob]

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]
    all hosts for 'yahoo.com' have been failing for a long time (and retry time not reached)
Reporting-MTA: dns; standard2.doveserver.com

Action: failed
Final-Recipient: rfc822;[email protected]
Status: 5.0.0


Why is this happening

[JohnDoh]

looks like DNS lookups are failing from your SMTP server, its not a Roundcube issue.

[wilsonob]

Thanks.

Any idea what i should or can do.

Thanks

[JohnDoh]

thats very difficult to answer. i dont know anything about your setup. as i said before the issue appears to be with your smpt server so look there, check the logs, test dns resolution etc.