Okay you can ignore the above, I just forgot specify where the aliase file is.
Now I can both send and recieve mail! :-)
My only problem is now that I can only recieve mails when my host name is in the adress like this:
jimmy@mailserver.domain.com
If I mail to
jimmy@domain.com the mail never gets through.
And the same goes when I mail out, the mailadress goes like
jimmy@mailserver.domain.com
do anyone know if its something I should set in postfix or something that has to do with my mx pointer?