Standard email is text, so the basic idea of font and formatting and styles might be dead in the water.
What happens next really depends on the email client at the other end.
If you don't know this, what you send might look OK or it might look an awful mess.
Before HTML, the convention was to imply bold-ness by saying *bold*
which some clients would display bold as a result.
Or perhaps learn some basic HTML.
http://www.w3schools.com/html/html_formatting.asp
Salem
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