Sure, if he doesn't care that his fancy tables and CSS formatting will look
like sh&t on my terminal, defeating the very first thing that marketing
material must do: look good.
Re:Ask HN: Plain text emails in 2017?
by notrheadagain on Wednesday August 30, 2017 @10:02AM
(#15132200)
The plain text versions I was talking about are those well-formatted and structured ones. Where you get the minimalistic beauty of simple formatting. Markdown-style, maybe.
So if OP sends an HTML mail, you will be able to read it anyway, proving that they don't need to send plain text at all :)