How to change mail sender header "From" in Postfix on a Plesk server?

Question

How to change the "From" mail header in Postfix on a Plesk server?

Answer

Since there is no functionality to change the sender, you can apply the following workaround to solve your task.

Apply the generic map via Postfix config:

1. Add to /etc/postfix/main.cf:

   # smtp_generic_maps = hash:/etc/postfix/generic

2. Create a map:

   # vi /etc/postfix/genericusername@domain.com jdoe@example.com

3. Generate map:

   # postmap /etc/postfix/generic

4. Restart the Postfix service:

   # systemctl restart postfix

In this case, the "From" header will be rewritten to jdoe@example.com.