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Knowledgebase: E-mail and Webmail
How do I tell if my ISP is blocking my outgoing mail?
Posted by on 22 July 2016 11:30 AM

 

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 mail.domain.com 25” 

If you see a message like: 

220 www.domain.com ESMTP 

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