It's possible that you need to check your DNS settings.
Start Smart Email Verifier. Click on the Tools menu, and select Options. In the Options window, switch to the DNS tab. Select Let me specify one or more DNS servers.
To determine what values you need to enter, you'll need to know the address of your Internet Service Provider's DNS server. Your ISP can tell you what values to enter here. Enter the address of one of your ISP's DNS servers in the Preferred DNS server area, and another in the Alternate DNS server area. (Two is enough, you do not need to enter any more.) Click Test. If the test succeeds, click OK.
You should have no trouble connecting to the Internet when the DNS settings have been updated.