I have a Postfix server that I am using as an outbound SMTP gateway for a mail server. The postfix server has a name such as smtp.domain1.com.
Now, I have users on my mail server that are trying to send messages to poorly formatted addresses, such as to user@domin. My postfix server is rewriting the address as firstname.lastname@example.org.
How can I configure postfix to not rewrite the address and bounce the message if the address is not complete? I believe this can be done with the append_at_myorigin paramter, but the Postifx documentation says that this feature must not be turned off.