Outlook 2000 sending Double emails : Microsoft Exchange

This is a discussion on Outlook 2000 sending Double emails within the Microsoft Exchange forums in Microsoft Tools category; When sending an email to an internal person in my network and to a person not on my network they receives two emails one from my exchange server and one from my internet email account as well. How do I stop Outlook from delivering emails to both the exchange 2000 sever and to the internet email account at the same time? This only happens when I am sending to both external and internal at the same time?...