- Click on Start -> Run, and type cmd and press [Enter] key.
- In the black command window, type: telnet mail.yourdomain.com 25
If you see "Connection Closed" or "Refused," then your ISP may be blocking any outgoing email connections. You may need to set your outgoing mail server to your ISP's outgoing mail server and not to your domain. For further information on other possibilities, feel free to contact Client Support.