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You may receive this error in your email client settings at some point. In Outlook this is a bug and can usually be resolved by restarting your email client and making sure you have SMTP Authentication enabled. This is usually not a server problem, and is caused by one of the following errors.

1. Your email client is misconfigured
2. Your ISP is blocking access to port 25
3. There is a DNS problem with your ISP
4. There is an error with SMTP on one of our servers

Below you will find the most common solutions to fix the above problems:

1. Shutdown and restart your computer.
4. Temporarly turn off all virus and/or firewall software.

If all of the above solutions fail, please confirm that the mail server is online and responding you can perform the following:

1. From the Start button click Run
2. Type in telnet yourdomain.com 25

You should receive something to the effect of:

220-orion3.sicc-online ESMTP Exim 4.52 #1 Day, XX Month Year HH:MM:SS
220-We do not authorize the use of this system to transport unsolicited,
220 and/or bulk e-mail.

This confirms there are *no problems* connecting with the SMTP server. For more information, please see the Microsoft support article.

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