There is another communties post I ran across that deals with this particular issue. You can find it at Preserving HTML formatting in issues created from email. The most common 'solution' is to actually attach the source email to the issue, retaining all related formatting 'exactly'.
One add-on that was mentioned was the JIRA Enterprise Mail Handler which may have the functionality you're looking for.
It started as any story starts, on a normal, rainy day. Admin meets App, and her name was Klok2, and like any first relationship we were both trying to make it work but neither one knew what...
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