Knowledgebase: Cpanel Control Panel > E-Mail
Simple Checks for Mail Blocks
Posted by Administrator on 24 December 2009 10:48 PM
Simple Checks for mail blocks

To see if your ISP is blocking 3rd part SMTP and POP

Some simple tests you can do.

Open a DOS window, type the following:

telnet 25

you should get something like this: ESMTP Exim 4.34 #1 Mon, 21 Jun 2004 10:57:44 -0700
220-We do not authorize the use of this system to transport unsolicited,
220 and/or bulk e-mail.

you can type 'quit' to exit.

telnet 110

result should be:

+OK POP3 cpweb3 [cppop 15.0] at []

you can type 'quit' to exit.

Mainly Its SMTP that would give you errors the first one with port 25. If you dont get that result you will need to contact your ISP and ask them what their SMTP (outgoing) mail server is and use that instead of your domain name.
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