You want to modify the following standard bounceback message of the Postfix system from IMSVA:
This is the mail system at host <hostname>.
Your message was successfully delivered to the destination(s) listed below. If the message was delivered to mailbox you will receive no further notifications. Otherwise you may still receive notifications of mail delivery errors from other systems.
The mail system <e-mail>: delivery via <host>[<IP>]:<port>: 250 2.0.0
Ok: queued as <ID>
To customize the bounceback message:
- Create the bounce_template_file, which is not defined in IMSVA by default. Follow the procedure in the Postfix article Postfix bounce message template format.
- Create the bounce.cf file.
- Restart the server.
- Verify the changes in the bounce message.