User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.1) Gecko/20060111 Firefox/1.5.0.1 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.1) Gecko/20060111 Firefox/1.5.0.1 The plain text wrapping setting in Tools -> Options -> Composition -> General is not applied to messages that are currently being composed. And there seems to be no way of changing the wrap setting for a message that you're currently composing. Well, you can save it as a draft, close it and then reopen it, but that will insert line endings at your current wrapping length, the one that you didn't want. :-) Would it be possible to either: (a) change the setting for a single composition window (b) apply the setting even to composition windows that are already open? Reproducible: Always

See also bug 169691. Be aware that, unless you've turned off format=flowed for composition, it makes little difference what the wrap column is, as most clients will display a f=f text message by reflowing the text to the window edge. See bug 168420 for information about f=f, including the informative FAQ attached to that bug. *** This bug has been marked as a duplicate of 84320 ***