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How to activate DKIM authentication
This guide assumes you have created the email domain and DNS zone already.
Inside ISPConfig web hosting control panel perform these tasks:
Go to Email module
Click on the domain you want to activate DKIM
Click on DomainKays Identified Mail (DKIM)
Check the enable DKIM field
Click on generate DKIM Private-key
Click on Save button
Only if your domain is being hosted by other DNS servers (e.g: cloudflare), then copy and paste the DNS-Record.