marketpress emails and paypal chained payments

hi i realise that my customers are not getting an email when they purchase an item, how do i rectify this. Also in enabling the global car option i am no longer seeing the chained payments option , is this configured for the main site and all other subsites use the paypal express check out option.

What I need clarified is if the paypal chained payment option is configured for the main site and the paypal express for the subsites respectively