In an effort to get a handle on who is signing messages with DKIM, I just added a message filter which automatically tags and stars any message that has been signed. I can now visually see which domains/users are DKIM-enabled, and get a sense for whether the mass is coming, and how quickly, etc.
This will also let me write better spam filters against DKIM messages, because I’ll have more data to analyze without have to waste time opening headers that aren’t appropriately tagged.
If I learn anything useful (which is doubtful), I’ll report back…
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