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Exim system getting DDOSed, need some quick advice.

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http://forums.cpanel.net – Hi folks, I should know this but I don't For the past few days, our email system has received a very bad DDOS attack. At this point we are quite desperate. It's just a simple question, all I need is advice simple advice it would seem. Thanks very much. --------------- Regarding exim_mainlog entries like this: 2012-08-31 15:54:18 SMTP connection from [64.132.92.169]:36391 (TCP/IP connection count = 144) 2012-08-31 15:54:19 SMTP connection from [65.25.104.113]:55800 (TCP/IP connection count = 145) 2012-08-31 15:54:19 SMTP connection from [216.27.86.177]:36975 (TCP/IP connection (HowTos)