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What’s DKIM provide?
Allows a domain to assert that it is accountable for a mail message
By adding a digital signature to the headers
Allows a receiving domain to use such signatures as yet another input in anti-spam analysis
May react differently if signature present and valid than if absent or invalid
Standardising reactions is not part of DKIM
Incidental benefits
Domain-level “Origin” authentication
Message/header integrity-check(s)
PPT Version