What about it? Your e-mail composer will tell you when you put something in your message which isn't plaintext and offer to convert your message to HTML for you to keep writing it.
You were claiming earlier that one shouldn't add formatting to their email, such as emphasizing using italics as it is the recipient who should decide how to format the email text. This is a completely different discussion from whether email that does happen to only require plain text should be sent as plain text or HTML.
You were claiming earlier that one shouldn't add formatting to their email, such as emphasizing using italics as it is the recipient who should decide how to format the email text. This is a completely different discussion from whether email that does happen to only require plain text should be sent as plain text or HTML.