I take into consideration the possibility that the recipient has his email software set to convert all emails to plain text, rather than retain HTML formatting. I'll format the sample, single spaced, in a plain text editor first, no indents for new paragraphs, but I do add a blank line between paragraphs. If something must be italicized, for instance, I type it _like this_ in the email. I do set the font to Courier on my end, just in case the recipient IS reading HTML. Then I email it to myself to make sure it doesn't look horrible, and make any adjustments before sending it to its final destination.