Hi everyone

Is there a quick way to force all (or per domain/CoS) external mail to be moved to the "held" queue, without restarting any Zimbra services?
We currently send through a relay MTA and I've tried setting that to a bogus port on our server but I think that setting needs a Zimbra restart in order to take effect.

I don't think switching the mode of the domains will work as I still want internal and incoming mail to be delivered and for users to be able to login.

Cheers, B