Error while configuring email

Error while configuring email

HI,
After we have configured our email and saved the password we are getting following error
" FAILURE :E-mail settings saved successfully. Could not find valid certification path to requested target, so kindly configure to apply Trusted/Self Signed Certificate"
Can you please help me in this thank you. I am also attaching the screen shot of the error for your reference. We have tested the connectivity to the mail server.

Thank you
Sudheesh

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