If your computer cannot reach some addresses, please check:
Are you behind a firewall? If positive make sure you are using an IP firewall, instead of an email firewall.
Do you use a dial-up connection? If positive, can you access normally the internet using the same computer you installed WorldCast? In this case, send me the log file.
make sure you have the "LOG" Enabled.
Run worldcast, go to the "servers" tab of the tools|configuration menu, and check the "Save Log" box.
Try sending/validating the emails again
In the end of the operation, right-click the "status" column and select "View Log".
Copy the Log file to the clipboard and email it to us, so that we can detect the problem.