On Tue, 23 May 2017 09:29:34 -0400, Joey Rutledge said: > Do you guys have any samples of the invalid Unsubscribe headers? There is a > newish spec (RFC8058; https://tools.ietf.org/html/rfc8058) that Iâve seen > floating around and wondering if those are the headers screwing things up.
That probably isn't it - 8058 adds a new "one-click' option to the very old List-Unsubscribe: (how old? RFC2369 is from last century). Or more properly, it's a method to tag the URI as being a one-click auto-ambush link, and that gratuitously following it in the MTA may piss the user off. For it to add to your queues, somebody would need to be using the one-click unsub with a mailto: URI, *and* your local e-mail purgatory software needs to (a) chase the URI as part of anti-spam/malware protection and (b) do so even if it's a mailto: rather than http: or ftp: or gopher: or so on. Having said that, I've seen lots more questionable design decisions....
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