Well, I kinda needed a custom POP3 proxy, and I wanted the flexibility to be able to do arbitrary nonstandard things with it (e.g., disobey parts of the RFC in carefully considered ways; for instance, respond to DELE requests by marking the message as having been retrieved by that user account already, if more than one account are sharing a mailbox (so I can play with new mail clients and still get my mail in the regular one)). But creating the whole server architecture and everything would have been a lot of work, and I never would have found a TUIT. But since Net::Server existed, all I had to implement was the POP3 protocol itself. Hence, Net::Server::POP3 was born.