Problems with recieving mail

[puntable]

Hello

I run a Magento store and have some problems with mail.

First some info about my VPS:
OS: Linux 2.6.32-042 stab062.2
Panel version: 10.4.4

Whenever Magento tries to send out mails to an emails with same domain as the store (example: recipient is mail@domain.com and my store is at domain.com) no mails get recieved?

As far as i can see the system sends out mail correctly and it works fine with lets say Gmail and Hotmail etc. Just not when the recieving mail have same domain as sender?

I have read somewhere, that this is a problem with the server and virtual mailboxes? Anybody able to help me out?

Thanks

Kind regards

 

[puntable]

This is from maillog.

I have my email on other server but subdomains of same domain as email created on this server. This can be a problem?

Oct 28 23:18:26 vps3184 postfix/pickup[16612]: 4C3AF4200FEB: uid=48 from=<apache>
Oct 28 23:18:26 vps3184 postfix/cleanup[16788]: 4C3AF4200FEB: message-id=<20121028221826.4C3AF4200FEB@vps3184.unoeuro-server.com>
Oct 28 23:18:26 vps3184 postfix/qmgr[730]: 4C3AF4200FEB: from=<apache@vps3184.unoeuro-server.com>, size=9765, nrcpt=1 (queue active)
Oct 28 23:18:26 vps3184 postfix-local[16791]: postfix-local: from=apache@vps3184.unoeuro-server.com, to=mikael@devilfish.dk, dirname=/var/qmail/mailnames
Oct 28 23:18:26 vps3184 postfix-local[16791]: cannot chdir to mailname dir mikael: No such file or directory
Oct 28 23:18:26 vps3184 postfix-local[16791]: Unknown user: mikael@devilfish.dk
Oct 28 23:18:26 vps3184 postfix/pipe[16790]: 4C3AF4200FEB: to=<mikael@devilfish.dk>, relay=plesk_virtual, delay=0.21, delays=0.14/0.01/0/0.06, dsn=2.0.0, status=sent (delivered via plesk_virtual service)
Oct 28 23:18:26 vps3184 postfix/qmgr[730]: 4C3AF4200FEB: removed
Oct 28 23:18:26 vps3184 postfix/pickup[16612]: D34504200FEB: uid=48 from=<apache>
Oct 28 23:18:26 vps3184 postfix/cleanup[16788]: D34504200FEB: message-id=<20121028221826.D34504200FEB@vps3184.unoeuro-server.com>
Oct 28 23:18:26 vps3184 postfix/qmgr[730]: D34504200FEB: from=<apache@vps3184.unoeuro-server.com>, size=9759, nrcpt=1 (queue active)
Oct 28 23:18:26 vps3184 postfix-local[16794]: postfix-local: from=apache@vps3184.unoeuro-server.com, to=info@godteposen.dk, dirname=/var/qmail/mailnames
Oct 28 23:18:26 vps3184 postfix/pipe[16790]: D34504200FEB: to=<info@godteposen.dk>, relay=plesk_virtual, delay=0.16, delays=0.09/0/0/0.08, dsn=2.0.0, status=sent (delivered via plesk_virtual service)
Oct 28 23:18:26 vps3184 postfix/qmgr[730]: D34504200FEB: removed
Oct 28 23:18:27 vps3184 postfix/pickup[16612]: 9DF394200FEB: uid=48 from=<apache>
Oct 28 23:18:27 vps3184 postfix/cleanup[16788]: 9DF394200FEB: message-id=<20121028221827.9DF394200FEB@vps3184.unoeuro-server.com>
Oct 28 23:18:27 vps3184 postfix/qmgr[730]: 9DF394200FEB: from=<apache@vps3184.unoeuro-server.com>, size=9764, nrcpt=1 (queue active)
Oct 28 23:18:27 vps3184 postfix-local[16799]: postfix-local: from=apache@vps3184.unoeuro-server.com, to=mikael@devilfish.dk, dirname=/var/qmail/mailnames
Oct 28 23:18:27 vps3184 postfix-local[16799]: cannot chdir to mailname dir mikael: No such file or directory
Oct 28 23:18:27 vps3184 postfix-local[16799]: Unknown user: mikael@devilfish.dk
Oct 28 23:18:27 vps3184 postfix/pipe[16790]: 9DF394200FEB: to=<mikael@devilfish.dk>, relay=plesk_virtual, delay=0.09, delays=0.06/0/0/0.03, dsn=2.0.0, status=sent (delivered via plesk_virtual service)
Oct 28 23:18:27 vps3184 postfix/qmgr[730]: 9DF394200FEB: removed

UPDATE:
Exact same problem in this thread, system trying to send mail internally: http://forum.parallels.com/showthread.php?p=645772#post645772

Please someone help