Moving domain to another server, mail still gets delivered locally

I recently moved a domain (@domain.com) to google apps, but will retain the mailbox archive on the iredmail server.
What's happening is that, when users from other domains on my iredmail server try to send messages to users from @domain.com, it gets delivered locally, even with the domain marked as disabled on the advanced domain config (iredmail pro)

==== Required information ====
- iRedMail version: 0.8
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): ldap
- Linux/BSD distribution name and version: centos 5
- Related log if you're reporting an issue:
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