Karen,
I "doubt" adding history-sites.com to your Outlook Express address book will correct the problem. It is most likely your Internet Service Provider's settings or, if you have a Spam blocker, it is the settings of this software installed on your PC.
Karen, if we continue to address this issue, how about we take it over to the News & Views message board at http://history-sites.com/mb/cw/nvcwmb/ ?
Thanks,
Jim