Exim receives the email but I don't find it.

Ok I know that the title sounds stupid, but it is the problem.

I've setup a server with directadmin. Everything seems to be working except one minor detail. We have a few email accounts already and they are receiving email. (we see that in the directadmin panel) but when we log in over POP or Web-mail we don't see the email?

We can send emails to everybody, but when they reply we see the disk space increasing but we don't find any email.

Check with webmail. Ensure your mail server is running correctly. Check logs.

Done that but i didn't find anything strange.

I've just reinstalled directadmin and currently it is up and running.