“a=” reflects the algorithm of the signature.“v=” is the version of the signature specification.There are required tags that all DKIM signatures must have, as the verification process would fail without them. A tag is a single letter, followed by an equal sign, while the value gives specific details of the email sender, the message, and the public key location. The information presented in a DKIM signature header field uses tag=value pairs. The DKIM signature header is in a unique textual string format, also known as a hash value. The DKIM signature is a special header containing essential information added to an email message.
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