Hi All, Late to the discussion on this but in an enterprise environment the number of messages with more than 1 recipient is much higher and you can't assume that there is only 1 recipient on a message. Splitting a message up that has multiple recipients will lead to issues with how those messages are processed. This is also true in the outbound path for enterprise mail where there is a high percentage of messages that have more than 1 recipient. I understand the need to ensure that we protect the BCC recipients, but I do think there are other ways of ensuring we protect against DKIM replay, ensure we can validate on return path without needing to move to a single recipient per mail. Either the way Bron suggests or a HASH with a mask (would allow to confirmation a user was not in the hash, or likely was) would give us the ability to handle both cases without meaning we need to break the way that SMTP works today.
Regards, Ross.
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