- Plesk Onyx for Linux
utility execution mail server was set to use a particular SSL certificate at Tools & Settings > SSL/TLS Certificates > Certificate for securing mail .
After execution of
utility mail server starts to use the default SSL certificate from server pool.
The old SSL certificate is displayed in Plesk.
This is Plesk bug #PPPM-5725 which will be fixed in future updates.
As a workaround:
1. Go to Plesk > Tools & Settings > SSL/TLS Certificates > Certificate for securing mail > [Change]
2. Reapply a certificate for securing the mail server.