Mein freund (sp?) Ehrenfried figured out what was happening and I have corrected it. "Send message in same format as received message" or some such was toggled on. So when Esther sent HTML and I replied, it was also in HTML. As I expressed to him, it was driving me crazy that I couldn't find or correct what I was being told was happening, as I have tried hard to avoid violating the list rules. Danke, Ehrenfried!
