If you want to use SMTP on Server / RDP, you MUST know how to check port which used as SMTP INFO as opened.
If the RDP don’t open port, you can buy our RDP always open all-ports: http://smtpdeal.com/3-spam-scan-rdp
You decided to use at the RDP INFO:
So, you have to check the IP: 22.214.171.124 will open port-25, so you can connect from IP 126.96.36.199 to SMTP 188.8.131.52 via port-25. That means SMTP can work at the RDP. Please do as below
2. Type “IP Address” and “Port-25” then press “Check” the button to get results