Mail gobbling up CPU: 120%

Hi,
Since upgrading to Mevericks my MacBook has been running super hot.
When I check the Activity Monitor, I find that MAIL is gobbling up CPU... sometimes in excess of 120%.
When I sign out of Mail, the MacBook cools.
Anything I can do to get Mail back to a more normal CPU usage? Never had this problem before.
Thanks!
Cat

Thanks. Appreciated.
Will tackle on my next day off!!!

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