Problem sending newsletter

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http://forums.cpanel.net – Hi, I have a dedicated server for sending emails. When I shot for 100 000 emails, it takes more than a day to send, but sends. If I shoot 500 000 emails a day, I can not in any way due to the lack of deliverability of the server: "Start Sending July 13 2012, 6:02 pm Finished Sending July 18 2012, 4:17 am Sending Time 106 hours, 15 minutes" It took five days and went to see "ConfigServer Mail Queues" and there is still 130 000 e-mail. Is to optimize the server or exim to shoot thousands of emails per hour? Max hourly emails per domain is set to "unlimited (HowTos)