![]() If you do not see it, add your accepted domain from domains page. Steps to Create, enable and disable DKIM from Microsoft 365 Defender portalĪll the accepted domains of your tenant will be shown in the Microsoft 365 Defender portal under the DKIM page. If the message is verified, the DKIM check passes. The verifying domain, or recipient's domain, then uses the d= field to look up the public key from DNS, and authenticate the message. The signing domain, or outbound domain, is inserted as the value of the d= field in the header. We recommend using both SPF and DKIM, as well as DMARC in your deployment.ĭKIM uses a private key to insert an encrypted signature into the message headers. Because DKIM relies on public key cryptography to authenticate and not just IP addresses, DKIM is considered a much stronger form of authentication than SPF. The addition of DKIM in this scenario reduces false positive spam reporting. In this example, if you had only published an SPF TXT record for your domain, the recipient's mail server could have marked your email as spam and generated a false positive result. Since the digital signature stays with the email message because it's part of the email header, DKIM works even when a message has been forwarded as shown in the following example. When you forward a message, portions of that message's envelope can be stripped away by the forwarding server. SPF adds information to a message envelope but DKIM encrypts a signature within the message header. How DKIM works better than SPF alone to prevent malicious spoofing
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