You've been downvoted but I believe your post is accurate. At least with regards to IMAP and any RFCs I've read myself, though I'm open to hearing from others.

You've been downvoted but I believe your post is accurate. At least with regards to IMAP and any RFCs I've read myself, though I'm open to hearing from others. Much of email is absolutely implemented in client-side 'de-facto' ways. edit: I see now in the RFC that there is a description.