For instructions, see the Use the Defender portal to customize DKIM signing of outbound messages using the *. domain section later in this article. The public key is published in a DNS record so destination email systems can verify the DKIM signature of messages.īut, you can also manually configure DKIM signing using the *. domain. Outbound messages are automatically DKIM signed using the private key. Microsoft automatically creates a 2048-bit public-private key pair from your initial *. domain. If you use only the Microsoft Online Email Routing Address (MOERA) domain for email (for example, ): You don't need to do anything. In fact, many hosted email services sign the message using the service domain, and then sign the message again using the customer domain after the customer configures DKIM signing for the domain.īefore we get started, here's what you need to know about DKIM in Microsoft 365 based on your email domain: A message can have multiple DKIM signatures by different domains.For more information about these addresses, see Why internet email needs authentication. The domain that's used to DKIM sign the message isn't required to match the domain in the MAIL FROM or From addresses in the message.Use the public key in the DKIM DNS record for the domain to verify the message signature.Look up the public key in the DKIM DNS record for the domain.Destination email systems use the d= value in the DKIM-Signature header field to:.The corresponding public keys are stored in DNS records for the signing domain (CNAME records in Microsoft 365 other email systems might use TXT records).The signing domain is identified by the d= value in the DKIM-Signature header field. The digital signature is stored in the DKIM-Signature header field in the message header and remains valid as long as intermediate email systems don't modify the signed parts of the message.From, To, Subject, MIME-Version, Content-Type, Date, and other message header fields (depending on the source email system).
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