Unable to setup incoming email (POP3s)(Port 995) using Dynamic CRM Email Router

I want to setup a email router for Dynamic CRM 365 for incoming (POP3s) & outgoing (SMTP) email with IBM Lotus Domino as the mail server .

When I clicked on the "Test Access" in the "Users, Queues & Forward Mailboxes", I get this error message for incoming email setup (POP3s)

"Incoming Status: Failure - A call to SSPI failed, see inner exception. The function requested is not supported "

Screen-Shot-2017_2D00_07_2D00_27-at-6.34.32-PM.png

I have enabled the log and checked the event viewer. Here's the log:

#26090 - An error occurred while opening mailbox HELLOWORLD/Ck/ACC@ACC. System.Security.Authentication.AuthenticationException: A call to SSPI failed, see inner exception. ---> System.ComponentModel.Win32Exception: The function requested is not supported
--- End of inner exception stack trace ---
at System.Net.Security.SslState.StartSendAuthResetSignal(ProtocolToken message, AsyncProtocolRequest asyncRequest, Exception exception)
at System.Net.Security.SslState.ProcessReceivedBlob(Byte[] buffer, Int32 count, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.StartReceiveBlob(Byte[] buffer, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.ForceAuthentication(Boolean receiveFirst, Byte[] buffer, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.ProcessAuthentication(LazyAsyncResult lazyResult)
at System.Net.Security.SslStream.AuthenticateAsClient(String targetHost)
at Microsoft.Crm.Tools.Email.Providers.Pop3Client.Connect(Boolean useSsl)
at Microsoft.Crm.Tools.Email.Providers.Pop3PollingMailboxProvider.OpenMailbox()
at Microsoft.Crm.Tools.Email.Providers.CrmPollingMailboxProvider.Run()

Any suggestions? Appreciate your help.

Thank you

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