- 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).