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Re: [ietf-smtp] Proposal: Updating VERP Specification

2019-12-13 12:59:07
To nobody in particular:

IMO, it is a Bad Idea to try to embed one address in another, and an especially Bad Idea to extend SMTP to try to facilitate that. If you want to know whose mail bounced, sure, add a small token to the return address when sending the mail.   Associate that small token with the original recipient address in a database, so when you get the NDN you can look up that token and see whose mail bounced.   But don't try to make it invertible.   You're only making the service less reliable by trying to do so, and also tempting people to try to decode information which should be opaque to them.


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