Server Authentication on POP IMAP in Exchange 2013

Hi,

I have configured POP and IMAP on Exchange 2013. The setting was configured that when unchecked server require authentication POP and IMAP working fine and in advance settings configured 995 and 587 with None.

If select the server require authentication receiving error on configuration. I would like to know that how can I secure my server to require authentication while sending emails or it is fine as SMTP 587 and POP 995 secure ports configured and no need to setup server authentication on SMTP setting. Please guide.