Strange mail problem

[mvdster]

Hello,

I have a strange mail problem.
Everytime when I wants to send a e-mail, the server adds de domain to the recipents email adres. For example.

When I wants to send an email to test@test.com, the server tries to send it to test@test.com.<domain>, this doesn't work off-course.

Anyone has an solution?

[till]

Please post the content of your postfix main.cf file (comments stripped).