Did you ever consider adding a Markdown to HTML email option?
This is especially helpful when sending formatted code around!
# 1. Put markdown on clipboard
# 2. Convert to hex
out=$(pbpaste | pandoc -f markdown -t html -s | hexdump -ve '1/1 "%.2x"')
# 3. Convert to an applescript data class
osascript -e "set the clipboard to «data HTML${out}»"
# 4. Paste rich HTML
As a programmer, having native markdown support in the app is something I wish for almost every day (especially for code blocks). It's something I plan to add.