Can't send or get mails

Hello,
I'm working with Postfix, Courier, Squirrelmail and ISPConfig3.

When I'm waiting for a mail I get this :

Don't know what is wrong.

master.cf:

main.cf:

 

ls -la /var/vmail :

 

Is this maybe the causer ?

 

I don't think this is the problem.

Can you post the output of

Code:

ls -la /var/vmail/chaos-network.zapto.org/

as well?

 

ls -la /var/vmail/chaos-network.zapto.org/:

 

Hm, that looks ok as well. What's the output of

Code:

df -h

?

Which distribution do you use?