You can use any working email for your iGive membership and it does not have to be the same email that you provide to stores when you shop.
Your information is protected with iGive. We never share, nor sell, any member information. For this very reason, our site is password protected, and with the stores you frequent, your iGive membership is identified by a meaningless member number (MID) that cannot reveal your membership email. This is how we track donations to your cause.
See also: Edit Your iGive Membership Settings
Worried about too many offers from stores? iGive strives to provide store donating opportunities at all the places our members wish to shop. Every store is unique and posts their own policies regarding the usage of any information you might provide to them. Stores will always want to encourage you to shop more. Some members use one email address for shopping, and another email address for personal/professional correspondence.
(Additional email addresses can be easily obtained from sites such as Google, Yahoo, Hotmail and many others.)