On Sat, 2019-04-27 at 15:09 -0400, Bill Cole wrote: > Yes, because the signature included the Sender and List-* headers, > probably non-existent originally, which mailing lists typically > (including this one) add to messages they relay. >
Like most mailing lists, mailop both modifies the Subject header and appends a footer to the message. It will always break all pre-existing DKIM signatures. As several others have mentioned, I believe the current Gmail restriction can be overcome by creating a valid SPF record for mailop.org. It's 2019, email authentication is not optional.
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