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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:
====


Hi,

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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Re: How to bounce back MX: Host not found mails immediately

*) Do you have "reject_unknown_recipient_domain" in Postfix setting "smtpd_recipient_restrictions"?
*) Could you please show us output of command "postconf -n" to help troubleshoot?
*) Addition reference: Reference: http://www.zimbra.com/forums/administra … ately.html