3 - dkim check

DKIM (DomainKeys Identified Mail) allows senders to prove that email was actually sent by them and has not been modified after being sent.
It achieves this by affixing a digital signature (seal), linked to a domain name, to each outgoing email message.

SpamStop will add a subject prefix, only if the message has not been signed correctly:

:: dkim-none ::      no DKIM-Signature headers (valid or invalid) were found  
:: dkim-fail ::      a valid DKIM-Signature header was found, but the signature does not contain a correct value for the message  

Sometimes it’s not possible to execute the check:

:: dkim-invalid ::   there is a problem in the signature itself or the public key record. I.e. the signature could not be processed
:: dkim-temperror :: some error was found which is likely transient in nature, such as a temporary inability to retrieve a public key

If the message has been signed using a different domain, a “diff” alert will be added to the subject:

:: dkim-diff ::      the message has NOT been signed by the sender's domain

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