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.
- 151 Users Found This Useful
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