[Zope] "@" in object id's : invalid

Hello, It seems that valid characters for zope id's are only : chars, numbers, "," "." and spaces. I'm wondering how I can store emails adress as valid zope object id's. I'd like to setup a simple list of emails stored as dtml docs with the emails as id. as "@" are invalid characters for zope id, I currently have no other solution than replacing those with "," which is not totally nice imho ;-) (i tried using "%40" but it's invalid too) Does anyone have an idea for my little problem ? Thanks Philippe