For my sins my broadband is provided by AOL. This means that I don’t have a static IP address which suits me fine.
My email is provided by Heart Internet and sometimes I get the following error message in Outlook.
Essentially this means that my PCs current IP address is on a Blocked List of IPs held by Heart Internet. Strange that an AOL IP address would be affected in this way.
The solution. Switch off your modem / Switch it back on and hey presto, a new (and hopefully unblocked IP address).