[Exim] High Load

When I start exim my load jumps to 2 to 2.5
This in not warrented. We dont have many users. Running tail against /var/log/exim_mainlog shows nothing unusual. When I run top, the top 2 proccesses are exim both using 99% CPU. When I restart exim it corrects the problem for a couple of seconds(almost a minute). What could be wrong?
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Joseph Kezar