My problem is with exim. If I try to do anything related to the mail service, server loads shoot way up and the system breaks. This occurs even if i just visit the mail queue manager in WHM. Just now that very task made the load shoot up from 0.6 to about 8.0. The problem is that even if I try to empty the mail queue via SSH, the system will break.
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How large is your mail queue? Typically when I've seen this issue the system was exposed and being used as a relay for spam, thus the queue was insanely large and causing significant performance issues.