Fix the LINE SPACING PROBLEM
If one designs, creates, text using a WORD PROCESSOR like "WORD", SINGLE SPACING, copy to YAHOO EMAIL, IT creates a TRIPLE SPACING text despite the SINGLE SPACING in "WORD". Yahoo appears to NOT HAVE LINE SPACING OPTION.
George Robins commented
On larger or special formatting emails, due to the FORMATTING LIMITATIONS OF the Yahoo space, I create the text on WORD them COPY and send.