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How do I know if my ISP is blocking my outgoing mail?




It is becoming more common that ISPs are blocking port 25 (SMTP port) forcing you to use their SMTP server. To see if you are blocked:

  1. Click Start Button (Windows Desktop).
  2. Click Run.
  3. Enter "telnet".
  4. Type "open mail.yourdomain.com 25"

If you receive a could not connect response than your ISP is blocking port 25. You should try changing your port to 26



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