Topic: Undelivered Mail Returned to Sender

==== Required information ====
- iRedMail version: 0.8.3
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Linux/BSD distribution name and version: Debian 6
- Related log if you're reporting an issue:


Could you tell me why the Undelivered Mail are returned to the postmaster account not to real sender. In my shop script when someone make an account, the email is send with confirmation by php mail. Is that the case?