The “h=“ tag contains the From header field.The identity of the sender’s domain matches the domain set in the signature.The version number meets the DKIM specification.Mail systems start DKIM verification by making sure: The message is now ready for a recipient server to verify the message hasn’t been modified in transit. This signature is computed and added to the outgoing message headers. This entry is treated as an empty string during the verification process. b=iHeFQ+7rCiSQs3DPjR2eUSZSv4i/Kp+sipURfVH7BGf+SxcwOkX7X8R1RVObMQsFcbIxnrq7Ba2QCf0YZlL9iqJf32V+baDI8IykuDztuoNUF2Kk0pawZkbSPNHYRtLxV2CTOtc+x4eIeSeYptaiu7g7GupekLZ2DE1ODHhuP4I=The cryptographic signature of all the preceding information from the DKIM-Signature field.bh=vYFvy46eesUDGJ45hyBTH30JfN4= The value of a body hash generated before the message headers are signed.The identity of the signer and is usually provided as an email address.From:Date:Subject:MIME-Version:Content-Type:Content-Transfer-Encoding:To:Message-ID The headers included with the message when it was cryptographically signed.It’s important that your DKIM signature use your domain name here because this bolsters your domain’s reputation with ISPs as you send valid email, regardless of the Email Service Provider you use. d= The email domain that signed the message. Domains can have multiple public DKIM keys, and the selector value makes sure recipient servers are using the correct public key.
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