Have a look at these links I found using google.com
Hopefully all possible reasons are contained in these links. Beware there is a difference between Outlook and Outlook Express and the reasons for duplicate copies can vary between programs.
Am I in the right place? I just began using outlook express and heve set up several e-mail accounts. My problem is that one of my accounts (e-mail address) receives copies of the mail sent to a second account as well as its own.
What did I do wrong and how can it be corrected?