- Plesk Onyx for Linux
Why DomainKeys and DKIM are not working together in Plesk Onyx?
The DomainKeys feature was replaced with the DKIM feature that fully substitutes its functionality. After upgrading to Plesk Onyx, DKIM will be automatically enabled on all domains with DomainKeys enabled. On Linux, DKIM will continue using the RSA key pair originally issued for DomainKeys. On Windows, a new RSA key pair will be generated for DKIM during the upgrade.
Please refer to upgrade notes for more information: https://docs.plesk.com/release-notes/onyx/upgrade-notes/