Mails from/to Mailinglists disappear

[mailingliste at dreampixel.de]

Hi at all,

I have a problem with my kolab3. I use two domains on the kolab-server:

gehr-edv.de
dreampixel.de

on the dreampixel domain is my mail-account for mailinglist configure  
(mailinglist at dreampixel.de). The primary mail of my user is  
sven.gehr at gehr-edv.de

The fetchmail:

poll mail.dreampixel.de protocol pop3 username  
"mailingliste at dreampixel.de" password "#Web8597Mail" is  
"sven.gehr at gehr-edv.de" here keep

when I send a mail from my google-account to mailinglist at dreampixel.de  
it works but I get no message from all my mailinglists.

whats wrong?

with best regards
sven