Mail using up memory and CPU

Since yesterday my mail started using up my memory. It clocked 99,9% of the CPU and was using 2,2GB of Real Memory. Can anyone please suggest where to start looking for the problem. I have only recently 'converted' to Mac.

Hello Jaco & welcome!
Open Console in Applications>Utilities & see if there are any clues or repeating messages when this is happening.
Safe Boot from the HD, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, Test for problem in Safe Mode...
PS. Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive
Reboot, test again.

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