Set up DKIM for Exchange online (Microsoft 365).

How to enable DKIM signing in the Microsoft 365 Defender portal.

implementation

• Switch to the DKIM DKIM (Domain Keys Identified Mail) is a method of e-mail authentication that uses a signature to make it difficult for the sender to falsify. Many providers of e-mail gateways are currently already using two DKIM keys to achieve even more security. Source & further information 2nd source page in the Microsoft 365 Defender portal: https://security.microsoft.com/dkimv2.
• Choose your domainA domain is a name that is unique and unambiguous worldwide on the Internet. The domain can be used for websites and emails.
• Update your DNSDomain Name System (DNS) is a decentralized search service that translates a human-readable domain name or URL into the IP address of the server hosting the website or service. This characteristic of the worldwide distribution of DNS is an important component of the Internet. DNS has been used since 1985. A DNS server serves two purposes. The first is to... settings as follows::
  Create 2 CNAME The CNAME record autodiscover simplifies the entry in the e-mail program. You don't need to enter an email server name or port number as this information is passed on automatically. For our recommendation Exchange online, the DNS entry is: autodiscover.outlook.com. records..
  
  Replace “YYY” with your domainA domain is a name that is unique and unambiguous worldwide on the Internet. The domain can be used for websites and emails.
  Replace “XXX” with your Microsoft TenantThe client (English tenant ) is the highest level of regulatory authority in the IT system and represents a closed unit in the system in terms of data and organization. The client thus structures the use of the system. A Tenant needed. The tenant is the “rented room” in the Microsoft data center, which is identified by the tenant name... prefix
  
  Host Name : selector1._domainkey Points to address or value: selector1-YYY._domainkey.XXX.onmicrosoft.com
  Host Name : selector2._domainkey Points to address or value: selector2-YYY._domainkey.XXX.onmicrosoft.com
• If you published the CNAME The CNAME record autodiscover simplifies the entry in the e-mail program. You don't need to enter an email server name or port number as this information is passed on automatically. For our recommendation Exchange online, the DNS entry is: autodiscover.outlook.com. records, the sync will take up to 4 days. If you get an error message, come back and repeat the last step.
• Then select Sign messages for this domainA domain is a name that is unique and unambiguous worldwide on the Internet. The domain can be used for websites and emails. with DKIM DKIM (Domain Keys Identified Mail) is a method of e-mail authentication that uses a signature to make it difficult for the sender to falsify. Many providers of e-mail gateways are currently already using two DKIM keys to achieve even more security. Source & further information 2nd source signatures in Enabled ()

Result

If everything worked, the result looks like this:

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