SSL mail certificate and PLESK 8.1.0, I can set SSL certificate for mail server?

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As the hosting control panel it is used PLESK 8.1.0.
I can generate self-signed SSL certificate.
I view that the generated certificate is setted for my domain (on the page <my domain name>/Setup).

But at mail reception/transfer received certificate is distinct from setted.
How to adjust mail server via PLESK control panel?

Best Regards, Dmitriy I.Cherkashin,
[email protected]