"maybe you could sell it to the vatican"
I agree! Though it is certainly worth the registration fee, in my opinion ... I think there's some confusion here, probably too much to overcome for any serious re-sale $$.
To me, it reads "PopeMail", which targets an entirely diffferent audience than the 'intent' of your post (with POP3Email.com). Also, to me, it reads/sounds as "PoppeyMail", literally (again using your original intention, as I read it). So, limited upside, but worth the bet.
Take care for now.