Same problem here. "apt-get install --reinstall postfix" helped to fix this problem.
- Bug#877992: postfix: Postfix does not start services after ... Jan Wagner
- Bug#877992: postfix: Postfix does not start services a... Daniel Haid
- Bug#877992: postfix: Postfix does not start services a... m-a-m-o
- Bug#877992: postfix: Postfix does not start servic... Heiner Markert
- Bug#877992: postfix: Postfix does not start services a... Kurt Roeckx
- Bug#877992: postfix: Postfix does not start services a... Bea