This allows store administrators to restrict which shipping options are shown to customers who are using a P.O. Box.
The module will allow to tell users which shipping carriers, such as UPS, won't always deliver to P.O. Boxes.
Unpack in your modules folder (usually '/sites/all/modules/')
Enable under Administer > Site Building > Modules
· Drupal 5.x/6.x
· Because customers type in their P.O. Box, it can be entered in any number of ways.
· The module tries to handle various punctuation and capitalization cases, but some may still sneak through the filter.