Error with mail sertificate SDP

Error with mail sertificate SDP

HI!

 Then i want to save mail server settings, SDP 8.0.0 build 8011
gives this errror:

FAILURE :E-mail settings saved successfully. Could not find valid certification path to requested target, so kindly configure to apply Trusted/Self Signed Certificate.

How can I attach mail server sertificate to the SDP?
In to the SDP server or SDP client ?

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