Hi All, Thanks for the responses and suggestions. I've deleted the old DKIM DNS record, and will be implementing a system to rotate the keys every 14 days, as a starting point.
To answer some questions: I don't think the emails have been modified in any way, although I haven't seen a complete copy of one. At least some of the people that get these messages are not spammer accounts, at least judging by the angry "Unsubscribe me!" emails they send our support email address. We currently sign all non X- email headers. Thanks, Mark
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