@benis @wolf480pl Nah, we tried. Too hard to whiteliste.

The /actual/ goal of this project is to allow guests on our guest network (which is an entirely separate internet connection, public ip, etc) to "borrow" some of our printers on the internal network.

But opsec policy dictates no connection ever allowed from the guest network to an internal system (even via an intermediary). Therefore I need jobs to be "pushed" from the guest network and "pulled" to the internal network to comply with policy.

The problem with mailboxes is that we'd have to manually whitelist the countless guests that arrive every single day and want to print. Because we don't want some public address anyone can spam with crap to print.

Also print via E-mail tends to work bad if you want to do anything fancy, like say print in A0