Coupon Address: Start by creating a new email address. Either sign up with an alternative service provider than your personal email address and keep both open in separate browser tabs, or use a separate browser window. To save time, avoid signing in and out to check each inbox.
Signing up: Use the newest address when you sign up for exclusive newsletters and offers.
Update: Make sure to update your current subscriptions to the new email address. Most services provide a link (typically at the bottom of an e-newsletter) or allow an address change through profile settings.