Can't send email.

Either port 25 is getting blocked at your end due to firewall configuration of your ISP blocking the port.

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.

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.

Alternatively, port 26 has been opened on the NetSpeedia server, so changing to this new port can also solve the problem.

Author: Mike Edmondson

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