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"