I am forced by certain email lists to send emails in plain text.

If I compose my email text in some other application (e.g. a proper text editor) and paste it into a yahoo mail message that is formatted as plain text, I find that the pasted text is stripped of all line end sequences, tabs, and spaces.

This is a BUG!

Alternatively, if I have a rich text format email, paste in my text, it looks fine at that point, but if I then convert the message in yahoo mail to plain text format, it now preserves most stuff except that it does remove all empty lines. How stupid! I need them to separate paragraphs!