User-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.4; en-US; rv:1.9.0.9) Gecko/2009040820 Firefox/3.0.9 Build Identifier: version 2.0.0.21 (20090302) I used Netscape mail for decades and I always write in short paragraphs, using two Return key strokes to achieve one line separation between each paragraph. When I attempt the same kind of paragraph separation in Thunderbird, everything looks properly spaced in the email composition window. But when Thunderbird transmits the message to others some paragraphs are separated by one line, and some paragraphs just run together with the previous paragraph, without any line separation. Reproducible: Always

Hi, could you write such email and send it to "someone else" and do two things : go to your sent folder and see if the email is still correct - save it as an eml file and attach it to this bug. Ask one of your recipient to save the eml file and have it sent to you. save the file and attach it here.

Bug 314213 :(