Why is mail receiving incoming mail twice?

Mail is receiving incoming mail twice. So it comes today and in a day or two it will receive todays mail again. Why is this happening and how do I fix it?
Thanks

Not likely to be spyware, but try canceling and see what some of the messages that get downloaded are.  It's possible that your account has been hacked and used to send spam, and you're getting flooded with bounces and angry complaints.
See:
http://www.reedcorner.net/guides/macvirus/is_it_malware.php#spam
(Note that my pages contain links to other pages that promote my services, and this should not be taken as an endorsement of my services by Apple.)

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