Hah, Thanks for the pointers, especially Ralph!
> I disagree about "very good reasons for footers on many lists". Meta > information belongs into the message headers, not the body. I've been thinking along those lines too... there could easily be new header definitions for "Suggested Tagging" and "Discretionary Advice" that could be rendered in all the lively colours that a Subject header and (plaintext) message body are lacking. This won't break a thing in terms of DKIM and DMARC; it doesn't call for something as complex as ARC. And even if it's a bit difficult in Postfix, it's doable and doesn't bring out cryptographic key handling, or parsing large messages before being able to sign and forward them. I've been trying to understand ARC's cryptographic design, as I'm not satisfied with its syntax-and-procedures level description. I have the suspicion that it may be over-engineered, but I can't pin that down yet. -Rick
