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Postfix version: 2.10.1

We have applications that send mail as app@domain.com. These applications send to a postfix mail server, to relay mails. I would like to rewrite the from address to be app@newdomain.com. I realise we need to change it on the app, but these changes will only go live in a few months, so I am trying to rewrite in postfix in the intrim

I have been able to rewrite all mails to app@newdomain.com but i just want mails from app@domain.com to be rewritten.

vi /etc/postfix/sender_canonical adding the following

/.+/    app@newdomain.com

This works, but changes all mail sent from the Postfix server to app@newdomain.com

I have also tried adding

 /app@domain.com/ app@newdomain.com

But this does not seem to do anything

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Found the answer.

vi /etc/postfix/main.cf

Add

smtp_generic_maps = hash:/etc/postfix/generic

Then open the following file

vi /etc/postfix/generic

Add the following

app@domain.com app@newdomain.com

Postmap the file

postmap /etc/postfix/generic

Now restart or reload postfix to apply the changes to main.cf

service postfix restart

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