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/Peo, FreeWebSpace.net
I was in the same situation some time ago. I havent been able to find a CPM sponsor for my everyone.net email, not even amazing media allow this (I've asked them). A non CPM sponsor might allow this. Maybe you should put a banner exchange banner on the email service to squeeze a couple extra hits to your site, that's what I did.
According to the Standard Internet Forums you are sometimes allowed (with approval) to link your 'logout' button to an AllClicks account and earn 3c per click. Or $30 CPM!