- Plesk Onyx for Linux
- Plesk Onyx for Windows
Email client connecting to the mail server configured by Plesk display expired SSL certificate error
Configuring a mail client, the domains name is set as Incoming/Outgoing mail server.
Valid SSL certificate is issued for example.com domain and installed in Plesk > Domains > example.com > Hosting Settings > Security > Certificate
Another version of the certificate is set for securing mail in Plesk > Tools & Settings > SSL/TLS Certificates > Certificate for securing mail.
Outdated SSL certificate was used to secure email
Configure email server with an actual SSL certificate: