How to enfore access rules on http://example.com as well as http://www.example.com

I want my visitors to see http://www.example.com rather than the same url without the "www". I have multiple domians pointing to the same Drupal instance, and use the Domain Access module to restrict access appropriately.

However, I cannot seem to get the access rules to work on the domains with and without the "www".

For example:

Say there is a page set to display only on the www.example.com domain at http://www.example.com/page. If one types in http://www.otherdomain.com/page, they are properly blocked from access as expected. However if one enters http://otherdomain.com/page, they get the content that should only be showing on the www.example.com domain.

It would seem that if I want all pages displayed without the "www" option, Domain Access provides a feature to handle the url rewrites. How does one enforce content access when they DO want the "www" portion displayed?

I've tried listing the domains both with and without the "www" in the domain record of the module, but nothing seems to work.

Could anyone assist? I know I could do redirects via .htaccess, but I have several domains and would rather not deal with changing the .htaccess every time I add or remove one.