Deleted /var/log -> mailman and maillog not working

I had some problems with a backup and the var/log folder was full (400 GB) so I desided to delete it. I know this was no good Idea! My Server is now running againg I had to create some folders inside /var/log until the Server could reboot without erros. My Server is running but mailman can´t be restarted and the /var/log/maillog is empty.

My System is: Ubuntu 14.04 with Plesk 12.5.3

Is there someone how may give me some advice to get mailman running again? It is...

Deleted /var/log -> mailman and maillog not working