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How to activate DKIM authentication

This guide assumes the following:

You have already created the DNS zone.
You have already created the email domain.

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.