Email sends 5 times?

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From: Zak (nowhere_at_yahoo.com)
Date: 01/05/05 

Date: Wed, 5 Jan 2005 14:38:42 -0800

>From time to time, I will send an email to a person and it will be received
by them 5 or more times. I look in my "sent" folder and it only shows one
email being sent. I have tried sending myself an email and I have gotten it
to send me the message 3 times.

I'm using Outlook 2002

Any ideas?