It is a nice explanation that Wendy has given. It took me a while as an emailer to understand about threads and to realize that changing the subject line did not in and of itself solve the problem. A person who doesn't understand about threads isn't going to understand why his/her replying to just any list email but changing the subject line can be a problem. To those of us who are experienced emailers this may seem glaringly obvious, but that isn't so for newbies or others who for some reason have never grasped the concept of threads. -- Cheryl "Where your treasure is, there will your heart be also."