*oops* I should have seen your snippet (and reply to that) before I posted mine, my humble apologies. I do however think it's nicer to "encode" the "mailto:" part too, not just the address. If you don't do it, you give spammers a hint. "Hey harvester! Here's a mailto link that you probably like, but I 'encoded' it". This way, you tell them, "Hey, here's /a/ link. Might be a mailto: link, might be something else" ;)

Besides that, I think a module is kinda overkill, since there's ord ;)