Suggestion: Partially disable formatting

[AlanHauge-Interacoustics]

This is more a suggestion than as issue.

I installed it, and it worked fine on the parts, I edited in the email. However, I was replying to an email, and it messed up the formatting on the rest. Therefore, I would suggest to add an option to write a markdown tag, for example:

<Markdown>
Something, *something* ***else***.
</Markdown>
After this no markdown formatting is applied.