Looking at DKIM adoption. I have seen statements that some mailers will do DKIM based reputation if available, but I have yet to see a statement as either: -an email not signed with DKIM will have its reputation lowered (less likely to pass filters) -an email signed with DKIM will have its reputation increased (more likely to pass filters)
I think if there were some postmasters making such statement it would boost the adoption of DKIM. I think stating that some postmasters are moving to domain based reputation is just encouraging the status quo of not DKIM signing to stay in IP based reputation.
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