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Support Center » Knowledgebase » General Information » How do I test connectivity to my mail server?
 How do I test connectivity to my mail server?
Solution The following steps explain how to test the connection to mail server. When an email is sent or received using a third party application, the information is sent across a specific route called a port. If the port being used is blocked, either by a firewall or your Internet Service Provider (ISP), information cannot be sent. The default port for receiving email (POP3) is 110. The default port for sending email (SMTP) is 25. If you are having trouble sending and/or receiving email then please test each applicable port to see if it's being blocked as follows:


SMTP:

1. On your local machine, open a command prompt.
2. From the prompt type: telnet mail.yourdomainname.com 25
3. If the port is not blocked, you will see a message similar to the following:


----------
220 mail.yourdomain.com ESMTP mailserver
----------

If the port is being blocked, you will see a connection failed message. To unblock the port, either open it in your firewall, or contact your ISP and ask them to unblock port 25. As an alternative, you can attempt to use port 26 to send email. To check port 26, please repeat the above steps, replacing 25 with 26. Before that port 26 should be configured in your mail server.


POP3:

1. On your local machine, open a command prompt.
2. From the prompt type: telnet mail.yourdomainname.com 110
3. If the port is not blocked, you will see a message similar to the following:


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+OK mailserver ready
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If the port is being blocked, you will see a connection failed message. To unblock the port, either open it in your firewall, or contact your ISP and ask them to unblock port 110.


Article Details
Article ID: 177
Created On: Feb 05 2009 04:18 PM

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