I was just tweaking some code that sends out email. I noticed in Gmail that the plain text version of the email was being shown even though it was a multipart message with both plain text and HTML alternatives provided.
htmlView = AlternateView.CreateAlternateViewFromString(
plainView = AlternateView.CreateAlternateViewFromString(
The fix was simple: add the plain text view to the message first. Yup, thatâ€™s all it took: