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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

Replies (1)

Restart the Servicedesk Service once.  Stop the Mail fetching under Admin-->Mail sever settings. If you have configured POP for the Mailbox, select the protocol POP while configuring the Mail Server settings under Admin tab. 

Refer to the troubleshooting Document:

Priya K