The EmailAccessController component, configured in CommerceAccelerator/Applications/B2CStore/Plugins/Checkout/src/main/config/atg/userprofiling, defines the rule set service to use when determining whether access should be allowed to the checkout page. It also provides the URL to redirect to if access is denied. It should be configured as follows:

$class=atg.userprofiling.RuleAccessController
enabled=true

# Rules used to determine whether access should be allowed
ruleSetService=/atg/targeting/EmailRuleSetService

# URL to redirect to if access is denied
deniedAccessURL=/checkout/checkoutlogin