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I'm curious if this does anything? I recently repointed a domain to a spam filter appliance and forgot to update this and it doesn't seem to have mattered...
The DNS Check button in the admin console provides an easy way to verify the MX record for your domain. If your MX record points to something other then the local server name you can change zimbraDNSCheckHostname. zimbraDNSCheckHostname applies only to the DNS Check button in the admin console.