- Plesk Onyx for Linux
- Plesk Onyx for Windows
- Plesk 12.5 for Windows
External service for DKIM validation (for example DKIMvalidator.com) reports that DKIM is invalid because the public key is not available after DNS lookup.
- DNS service in Plesk is not adjusted properly (domain zone could not be visible for the DKIM validation service)
- Used mail domain name is not real (i.e. mydomain.com, example.com, etc...)
- DKIM related DNS resource records in the used domain zone are broken or removed
Use the following steps:
Real domain name should be used to send email from it.
Domain should resolve globally to a correct IP from Plesk. If different IP is detected in the global DNS search, change domain's DNS Settings.
DKIM related DNS resource records should be inside of the domain zone.
Disable and enable again mail signing using DKIM in Plesk.
Wait for the DNS propagation period. The changes made will be loaded, applied and synchronized by DNS (it may take up 48 hours, but mostly faster).