[BlueOnyx:01831] Fails to deliver mail

[Martin Jensen]

Hi all,

I have installed two BlueOnyx servers, and they are running great.
They have the latest updates. And i have installed the NRPE2 deamon from 
rpmforge (cannot find the client on the original repositories). However 
I made sure that nothing else came in, and removed the repository as 
soon as the installation finished.

The problem is that the servers do not allow email in.

When i write an email to a new user - I get the following error:

I'm sorry to have to inform you that your message could not be delivered to
one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can delete your own
text from the attached returned message.

                   The mail system

<user at domain.se>: host HOSTNAME said: 550 5.7.1
    <user at domain.se>... Relaying denied. Proper authentication
required.


SMTP Auth is turned on (I would like the costumers to be able to use 
outgoing SMTP from their laptops).

Hope somebody have a solution.

Thank you!