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ISP blocking outbound Email/SMTP knowledgebase

How to tell if my ISP is blocking outbound Email/SMTP

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. Enter "open"

If you see a message like:


Then you are not blocked. If you can't connect, you are blocked. You should change your port to 26.

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