cPanel has introduced an auto-discover SRV into zone files for domains that are apparently in /etc/remotedomains with the new WHM upgrade.

An additional SRV line is added that send email clients to a cPanel page (cpanelemaildiscovery.cpanel.net) rather than to their Echange server.

They have added a ‘beta patch’ in this forum link. In order to disable the autoconfig/autodiscovery support on remote domains, please see the info located here:

http://forums.cpanel.net/f5/autodiscover-dns-records-299412.html#post1247492

You do need to be in the correct sub-directory as shown on this page to successfully run that patch command.