Topic: How to bounce back MX: Host not found mails immediately
==== Required information ====
- iRedMail version: 8.4
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Linux/BSD distribution name and version: Centos 5.6
- Related log if you're reporting an issue:
I would like to know how can I BB these immediately as I get a lot of them, If there is any config in postfix it will be helpful
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