I would like to have the possibility to run the following setup: local accounts: email@example.com firstname.lastname@example.org In the domain table, I've added domain.com and in the mailbox table I've added user1 and user2. This functions without problems. If an email is received for a non existing local mailbox I want the mail to be forwarded to a different SMTP server. In the transport table I added an entry: domain.com smtp:[IP.OF.SMTP.SERVER] But unfortunately all mail is now forwarded to the SMTP server and mail to user1 and user2 are not delivered on the local system. What can I do so that postfix does "mailbox before transport" instead of "transport before mailbox"?