How to rewrite outgoing address in Postfix ?

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Here are the quick steps to accomplish this:

# vi /etc/postfix/main.cf

Modify the “mydomain” variable to your email domain

# mydomain = example.com

Make sure to uncomment the proper network interface.

# inet_interfaces = all

Now at the bottom of this file you need to specify the generic map file for rewriting the address.

# smtp_generic_maps = hash:/etc/postfix/generic

Save and exit main.cf. Now we need to edit /etc/postfix/generic

# vi /etc/postfix/generic

You need to specify the mapping of the original address to the one you want. Since in this case I just want to rewrite everything I usually add the following two lines and it seems to catch everything.

root@example.com   no-reply@example.com
 @example.com       no-reply@example.com
 

Save and exit the file. Now we need to create the postfix db.

# postmap /etc/postfix/generic

This will create the /etc/postfix/generic.db hash file.

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