Are the accounts in xyz currently? (like you removed xyz from a virtual host, made it a new domain of it's own, and moved users to it?)
(You never mentioned your DNS/MX or hostname records so I assume you have no trouble with that.)
Also-If you want the Zimbra server to relay all mail destined for a particular domain to another mta, you can forward the domain.
Quote:
zmprov
md example.com zimbraMailCatchAllAddress @abc.com
md example.com zimbraMailCatchAllForwardingAddress @abc.com
md example.com zimbraMailTransport smtp:somemta.abc.com
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ManagingDomains - ZimbraWiki
to set the default domain there's:
zmprov mcf zimbraDefaultDomain domainthatyouwantdefault.com