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First Way- Go here »port25.icannotconnect.com/ Second Way- The Telnet Test for SMTP Server Connectivity If you think your account has had the evil Port 25 block applied and your external SMTP server does not seem to be there anymore then this little test will tell you what is what: 1) Open a command prompt. If you can't find the little sucker in Windows just hit "start", click on "run" and type cmd. If you are running Linux or a derivative, we'll just assume you already know how to run Telnet on a port other than 23. 2) In that command prompt "DOS box", type telnet mail.dslreports.com 25 which will result in one of two results: a) NOT blocked: The screen will clear and then you will see 220 mail.dslr.net ESMTP Postfix. Type quit which will get you 221 Bye Connection to host lost. b) BLOCKED: Connecting To mail.dslreports.com...Could not open connection to the host, on port 25: Connect failed
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