hm, i think you don't get me right. this is something, that would a user to allow polling. whether you add a pop3 poll or rss poll, if you add an interface to do stuff like that, you should do it like that you can do it with other polls too...
perhaps a way to bridge user configurations into files? that way you perhaps could easily add stuff like fetchmail or other jobs running externaly and feed their results into citadel?