I am using zimbra collaboration suite 5.0.I ,configured two domain in zimbra.Both domain configured as a Relay MTA for external delivery.Our main account is google apps and another one is hosted to some local registrar only.If i check the details for the mx record through Zimra admin console(through internet explorer) first domain mx record is working fine but second domain mx record getting error( server error encounterd,failed to verify the mx record).I think this is MX record problem.How to add mx record for the second domain as relay MTA for external delivery.
This both domain was working properly suddenlty started the problem Kindly provide a solution .

Thanks
Jamal