"URLProxy" was a feature in CanIt-Domain-PRO email filtering software, that handles rewritten (proxied) URLs in emails that had been rewritten (based on rules of the CanIt-Domain-PRO system). The rewritten URLs would take the users to an URLProxy landing page, with some basic information around the original URL, like: hosting domain, country etc.
This simple web-app is a free-standing 2.0 version for Mailfilter-ng.