> Have you been using it in an enterprise scenario?
Yeah, sort of, an academic/hospital setting. Actually, I combined my academic and personal e-mail addresses into one at a custom domain, and forward other accounts to it, which annoys some colleagues.
Most people here use Outlook. Sometimes people might have a mailto: link in sig (which gives me a chuckle as it's pointless), but I don't ever remember encountering embedded images.
The biggest human offenders for sending HTML-heavy e-mails are university-wide announcements. In my mind, these fall closer to spam than ham, and what useful information is in them can usually be gained from the title.
> Roughly 90% of the direct email I receive in my inbox comes through in HTML form.
Same, because I haven't bothered to set up spam filtering. But of the e-mails I actually want to read, well below 5% do.
> Plain text is more often coming from mailing lists and automated systems that email me.
Fascinating. For me it is just the opposite. People don't usually seem to bother using HTML, consciously at least. But automated systems use it quite liberally.