1. First make sure that you can ping the pop3/smtp server. See the following KB article for step-by-step instructions.
If you get a reply then we move on to the next step, if not it could be due to dns issues (contact your ISP) or your domain is still propagating.
2. Start a telnet session
SMTP - Your should see a message like below:
220-We do not authorize the use of this system to transport unsolicited,
220 and/or bulk e-mail.
Where "mydomain.com" is the name of your domain.
Cause
1. There is something wrong with your DNS servers - contact your ISP
2. Domain is still very new and busy propogating - give it more time (usually 24 after registration)
3. Ensure that your connection is functioning correctly and you are able to see most websites and they are not slow, check cnn.com / microsoft.com / google.com - contact your ISP if most websites are slow
4. If the response times are very poor, 1000+ (check the time=XX section in your ping results, see above step 1) it is a cause for concern and means that you are receiving slow speeds to our mail server. If the rest of the internet appears to be functioning correctly you should contact us and let us know of the issue, please provide a traceroute to our server.
5. Our DNS service may be down (least likely and in any case should never be down for more than a few minutes).