Root can not send mails to WHM/Cpanel servers

[CoolMike]

Hi

I have the following problem on one of my servers. The status messages from upcp and other mails sent from root stay in the queue and get never delivered. I'm getting the following error message:

root@name [~]# echo test | /usr/sbin/sendmail -v $test@domainonserver2.com
LOG: MAIN
<= <> U=mailnull P=local S=666
LOG: MAIN PANIC
User 0 set for local_delivery transport is on the never_users list
LOG: MAIN
== root@name.server1.com R=localuser T=local_delivery defer (-29): User 0 set for local_delivery transport is on the never_users list

I can send mails to other servers, but not to my own servers.

Any ideas?

Thanks
Mike

[CoolMike]

I just found this here:

http://exim.work.de/exim-html-4.20/d..._5.html#TOC179

But I don't think this is a solution, because all the other servers have the same settings and there it works...

Mike