How to check if my ISP blocking SMTP Port

How to check if my ISP blocking SMTP Port

You can run a quick test on your local computer's operating system to see if your ISP is blocking the default port 25 SMTP port, for sending (Relaying) mail.

Microsoft Windows XP:

Start Button >> Run >> type this command 'cmd' (without the quotes around cmd)

Windows Vista/Windows 7

Start Button >> In the smart search bar enter 'cmd" (without the quotes around cmd)

Mac OS X:

Navigate to /Applications/Utilities and double-click on Terminal icon.

Enter this command once you have command prompt (Windows) or terminal (MAC OS/X) window open:

telnet domain.com 25 (domain.com being the domain name)

If your ISP is blocking the SMTP port 25, you will get response similar to below:

Connecting To domain.com...Could not open connection to the host, on port 25: Connect failed

If you do receive a response back similar the one below, Port 25 is not blocked:

220-domain.com ESMTP Exim 4.69 #1 Tues, 22 Mar 2011 22:11:01 -0500

220-We do not authorize the use of this system to transport unsolicited,

220 and/or bulk e-mail.

*Notice*

The response posted above is just one of many examples that you receive when verifying if port 25 is blocked.

The one you receive may not be or look the same as posted above. It
just gives you confirmation that the port is not blocked and you are
able to send mail out.

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