error connect to Exchange SMTP server when configure outlook

Dear All 

- My system using Mail Server Exchange 2013.

- I have seccess sent and receive mail via OWA.

- I have configuration in outlook, I connect to Exchange Server via POP SSL ( port 995) is OK, but connect to Exchange Server via SMTP TLS (port 587) is error : Send test e-mail message: Your server does not support the connection encryption type you have specified. Try changing the encryption method. Contact your mail server administrator or Internet service provider (ISP) for additional assistance."

I have checked in Outlook web APP > Setting > Settings for POP or IMAP access...  

" POP setting  
  Server name: 172.16.1.2
  Port: 995
  Encryption method: SSL 

  IMAP setting  
  Server name: 172.16.1.2
  Port: 143
  Encryption method: TLS 

  SMTP setting  
  Server name: 172.16.1.2
  Port: 587
  Encryption method: TLS  "

Please help me fix it

Thanks so much