Hi. I've always thought that the listserv software didn't make distinctions between upper and lower case characters in an email address, but I just found today that someone had subscribed to the list twice once in all CAPS and then again with the same address in lowercase letters. They both stuck and now suddenly she has started to complain about receiving dupes. [log in to unmask] Subscribed on 10 Oct 1998 [log in to unmask] Subscribed on 22 Oct 1998 SO ... is the software case sensitive? Or is this just a fluke that got through when nobody was looking? And it it was a fluke will deleting one delete both? I should mention that I am using Listserv 1.8d most recently available beta on NT 4.0 with SP3. Thanks for the answers/ideas/suggestions. Karen Strauss Reflex Sympathetic Dystrophy Network