I've installed a debian server and all works great.
I've followed this tutorial:
In my server I have only one domain and about ten mailboxes for this domain.
Now I have a lot of problems because one or two mailboxes can't receive some messages.
The error shown on sender mail program is:
Failed: 5.4.0 (other or undefined network or routing status)
Is it a postfix configuration problem? smtp problem? a problem on network server?
Thanks a lot for your help!