Mail 2 Group duplicates – Mail 2 Group Review

I have been using Mail2Group for our prayer group, 20 contacts with no problems what so ever. Now I am trying to use it for a larger group, 101 contacts, and every time I try and email I end up with duplicate contacts! However, when I edit the group to fix the list, I can not find any duplicate contacts. I have emailed their support group to see if there is a fix. I will write another review when/if I get a response.
Review by Gluten: on Mail 2 Group.