Problems with DL Causing Endless Loops

Hello there,

I'm using Outlook 2007 with Windows Vista.

I've tried to develop a DL using my Contacts. I created a new DL, named it
and then selected the Contacts. I chose 4 names to test it out because I've
had problems before. I then saved and closed the DL and composed my message.
Next, I selected the DL using the Bcc field, put myself into the To field and
hit send.

The results: an endless loop of Sending/Receiving that can only be stopped
(at least the only way I've found so far) by closing Outlook with the "X".
(One time it got to 240 times.)

Any thoughts would be greatly appreciated!