Ok.
What about real mail server settings.
Could you show screenshot from:
MailEnable > Servers > localhost > Properties > SSL
MailEnable > Servers > localhost > Services and Connectors > SMTP > Properties:
General
Inbound > Settings
Hi.
Have you secured mail in Plesk? If not, you should go to Tools & Settings > SSL/TLS Certificates > Certificate for securing mail, and choose any installed certificate.
After this, mail server will support SSL/TLS.
MailEnable supports TLS on 25 and 587(message submission) ports.
SSL is...
Hello,
could you try to start Plesk Autoinstaller from cmd running by Administrator and complete upgrade?
For run cmd by Administrator, you have to find cmd in Start Menu, click right mouse button and choose "Run as Administrator".