Email delivery problem [details inside]

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http://forums.cpanel.net – I am having WHM + cPanel on my CentOS server. Emails from my domain (which is on dedicated ip) are taking hours for delivery. Some even not being delivered. Could anyone suggest the possible problem and the checks that I should perform? I sent one email to my personal gmail id. It came to Gmail 6 hours after it was sent (showing in gmail that it was sent 6 hours ago). Please help. (HowTos)