[MlMt] New to MailMate - Questions about outgoing mail fonts - Resolved, but one follow-up Q

[Johnny]

Thank you, Malcolm, Verdon, and John. And especially Bill for providing answers I was looking for. I've been on the net since 300 baud, acoustic coupler Arpanet connections, and get where you're coming from. I'm a lawyer and 80% of my peers use Outlook with HTML email, and many have graphics in their signatures. I'm essentially competing with them for credibility. 
Good news: I won't be emailing any of you in HTML. My emails to this list are in plain text. :)
Better news?: After testing and consulting with a colleague, I'm going to use MailMate with Markdown. I will not specify any font in the email body. I know you all prefer no HTML, but does this at least improve things? I figured out how to make my current Apple Mail signature in HTML, and do have an HTML signature. But without any embedded graphics at present. 
One follow-up question: What does the Default Theme setting do? I've tried all the Themes and my emails look the same, regardless. Thank you again for your replies. 
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