Stop sending me your errors

When email systems cannot generate a plain text version of an email, they often mistakenly send "Plain text version not available" as the text/plain part, misusing the multipart/alternative MIME format which is meant for equivalent versions of the same content. This approach frustrates users across all scenarios—from those on ancient email clients who see only gibberish, to modern users who prefer plain text and are forced to manually switch formats. The author argues that omitting a text/plain part entirely would be preferable, as it would allow email clients to handle the situation more gracefully than presenting a confusing error message.