I would say that the answer is "if you get 1000 copies to 1000 different customers of yours of something which says donotexplode then somebody messed up".
There's no way to know if you only got one of them that it was exploded, unless someone fesses up. Bron. On Wed, Aug 12, 2026, at 05:41, Hannah Stern wrote: > Hi! > > The draft says: > > If a verifier receives a message with a donotexplode request and > a later hop has indicated that it has exploded the message then > the message SHOULD be rejected. > > So according to how I'd plainly read it, the verifier would only check > if any subsequent hop has the "exploded" flag. > > However, what if a hop explodes the message without setting the flag? > Should a verifier possibly also check whether it has more than one RCPT > TO in the incoming SMTP session? And for rt= with more than one item > after the "donotexplode" hop? > > However, rt may contain more than the actual recipient set, so would > prohibiting rt with more than one element after "donotexplode" possibly > be "overblocking"? (Even if it doesn't really make sense for a > non-exploding hop to add more than one rt?) > > For "donotmodify" it's specified that header fields may be added still. > If the recipes were optimal, that would mean that there are only "c" > entries. However, if a site reorders existing fields, it would need to > use "d" at least somewhat (due to the monotonicity requirement on copy > rules), and of course if a site is extra simplistic it might use "d" > even when "c" would work. So in the end we'd possibly need to create a > set of fields in the new version, and for each header field in the old > version, check if it's in the new set? Or how would you implement that? > > Hannah. > > -- > Hannah Stern > > Software Developer > Mail Transfer Development > > 1&1 Mail & Media Development & Technology GmbH | | | > Phone: +49 721 91374-4519 > E-Mail: [email protected] | Web: www.mail-and-media.com www.gmx.net > www.web.de www.mail.com www.united-internet-media.de > > Hauptsitz Montabaur, Amtsgericht Montabaur, HRB 5452 > > Geschäftsführer: Alexander Charles, Dr. Michael Hagenau, Thomas Ludwig, Dr. > Verena Patzelt > > > Member of United Internet > > Diese E-Mail kann vertrauliche und/oder gesetzlich geschützte Informationen > enthalten. Wenn Sie nicht der bestimmungsgemäße Adressat sind oder diese > E-Mail irrtümlich erhalten haben, unterrichten Sie bitte den Absender und > vernichten Sie diese E-Mail. Anderen als dem bestimmungsgemäßen Adressaten > ist untersagt, diese E-Mail zu speichern, weiterzuleiten oder ihren Inhalt > auf welche Weise auch immer zu verwenden. > > This e-mail may contain confidential and/or privileged information. If you > are not the intended recipient of this e-mail, you are hereby notified that > saving, distribution or use of the content of this e-mail in any way is > prohibited. If you have received this e-mail in error, please notify the > sender and delete the e-mail. > > _______________________________________________ > Ietf-dkim mailing list -- [email protected] > To unsubscribe send an email to [email protected] > -- Bron Gondwana, CEO, Fastmail Pty Ltd / Fastmail US LLC [email protected]
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