root emails could not be delivered

[MtK]

in continuation to this post: http://www.directadmin.com/forum/showthread.php?t=39973

I'm getting this error:

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]
    (generated from root@DIRECTADMIN_DOMAIN.COM)

where:

• [email protected] - is a valid email (reachable from the outside world and working for a few years now)
• DIRECTADMIN_DOMAIN.COM - is a valid domain where DA is installed (and working)

the mail queue is getting bigger

 

[nobaloney]

Did you check the logs?

Jeff