Dear experts,
Do you have anyways to disable RBL checks for mailbox server? I have two server: one Zimbra mailbox server with MTA, and one Zimbra MTA server. I've tried to enable RBL checks in Global Setting, It applies for both Zimbra mailbox server and Zimbra MTA server. I only want to have RBL checks on Zimbra MTA server, not Zimbra Mailbox Server. Please help me!

Thanks,