Could not find valid certification path to requested target,so kindly configure to apply Trusted/Self Signed Certificate

Could not find valid certification path to requested target,so kindly configure to apply Trusted/Self Signed Certificate

I have enabled POP based mail retrieval on sdp latest version and upon saving it says:
 
FAILURE :Email Settings saved successfully. Could not find valid certification path to requested target,so kindly configure to apply Trusted/Self Signed Certificate
 
The mail server is a linux one where pop is provided by dovecot


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