I downloaded 1.5 some time ago and discovered that "Do not Expand groups did not work". I noticed it was a documented bug. I download versions afterward and tested to see if this was fixed. Downloaded 1.7b and tested. When I setup my preferences and choose "Do Not expand personal groups" then create a message, the recipients can see all their names in the To: field.

I'm writing just to keep you in the loop. I love all the functionality the group has provided. Please keep up the GREAT work.