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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