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How do I check to see if my ISP is blocking port 25 (SMTP) for outgoing email?

You can run a simple test to see if your ISP is blocking port 25. Open a command prompt for windows or Terminal.app for OS X and type in the commands below.

telnet yourdomain.com 25

If your ISP is blocking port 25 you will not get a response back. However if it isn't blocking port 25 you will see an output similar to the one below.

[user@host:~]$ telnet yourdomain.com 25

Trying xxx.xxx.xxx.xxx...

Connected to yourdomain.com.

Escape character is '^]'.

220-host.domain.com ESMTP Exim 4.69 #1 Mon, 07 Jul 2008 00:22:59 -0600

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

220 and/or bulk e-mail.

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