==== Provide required information ====
- iRedMail version and backend (LDAP/MySQL/PGSQL): iRedMail-0.8.1 LDAP backend
- Linux/BSD distribution name and version: CentOS 6.3
- Any related log? Log is helpful for troubleshooting.
====

I try to set amavisBlacklistSender to @. to block all incoming email for a particular user and it seem not working. If I use @example.com, it work by blocking all sender from @example.com domain. Is that normal for amavisBlacklistSender?

PS: If I use @., I can receive the email but it is marked as ***SPAM***