Mail has high cpu use

I have searched the discussions and tried all the suggestions and am not having any luck decreasing the cpu use of mail. As soon as I open the program it starts increasing the cpu usage until it hits high 80's. I eventually have to quit just to quiet down the computer due to increase in fan noise.
I have trashed the preference file. Rebuilt all the mailboxes. Emptied the trash. Run disk utility.
I can not think of any reason for this to just have started happening. I have not done any new installs. Does any one have any suggestions?
Thanks...Lenny

So...what does this mean?
It means there is something about your user account that is the cause of your CPU usage for Mail, not Mail itself. Did you install any software just before this started happening? If so what was it, specifically? Try this to see if it makes any difference:
Quit all applications and use Disk Utility to Repair Disk Permissions. Ignore any messages about SUID or ACL; it means nothing. Quit when it's done. Next, go to ~/Library/Caches/Mail and delete the contents of that folder, then use Get Info to Lock the folder.
Also, if you have any Bundles installed for Mail at ~/Library/Mail, disable them and then restart Mail to see if the problem continues.

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