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v=DKIM1; h=sha256; k=rsa; s=email;F
DKIM supports multiple digital signature algorithms. Two algorithms are defined by this specification at this time: rsa-sha1 and rsa-sha256. The rsa-sha256 algorithm is the default if no algorithm is specified. Verifiers MUST implement both rsa-sha1 and rsa-sha256. Signers MUST implement and SHOULD sign using rsa-sha256.VS
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