List sends two of every email.

[<eagle@xxxxxxxxxxx>]

I am getting two copies of every message sent to the list. 
How do I fix it? I set amxfiles to digest now. But I like the individual
messages. I am using Outlook.
AMC content:
While a long time lurker on the list I read all of the email. I have learned
quite a bit about AMC's from the conversations going back and forth.
I tend to delete any message with non AMC content right away. 
That includes long winded opinions.
But overall the list has helped me save my 70 Ambassador SST from the
crusher. I was literally on the phone with a junk yard to get it towed away.
And one of the messages was on my screen about saving AMC's at any cost. And
it changed my mind. I was able to accidentally find www.autorust.com
And they restored the undercarriage. (Click on the car)
I will need some quick answers to help me finish my restoration.
My car will soon be a daily driver and I want to thank every one on the list
for their assistance!
Rick N.
70 Ambassador SST
85 Eagle wagon Limited  Sold this Friday (BOO)
84 Eagle Sedan
89 Jeep Grand Wagoner
90 Jeep Comanche next project?
98 kia sportage (crap)