Upon installation of PoliteMail you receive a Windows error that says
Error 1606: Could Not Access Network Locations

This is a problem on your system, related to an incorrect Microsoft Windows registry setting.

To fix this problem, you must modify the Windows registry.

It’s a good idea to create a restore point and/or back-up the registry file first.

http://support.microsoft.com/kb/322756/

You can use the Microsoft fix it tool, or modify the registry yourself, following the instructions provided by Microsoft:
Fix Error 1606

http://support.microsoft.com/kb/886549