Hi Guys,
I have an installation of Zimbra 6.03 on my Centos5 Server.

I want to put in a whitelist/blacklist some domains and I follow this guide:
Improving Anti-spam system - Zimbra :: Wiki

I try to modify the file /opt/zimbra/conf/salocal.cf.in (is a Read only file, but I changed the permissions) adding this lines at the end, just for testing:
blacklist_from *@gmail.com

After I have restarted Zimbra services but I continue to receive mails from gmail.com, so the modification doesn't affect the system.

I know that is possible to define whitelist/blacklist for single users from webmail options.
Is possible to set a whitelist/blacklist for all the accounts as a global setting?

Thanks in advance.

Stefano