More than likely they didn't enter an email address before abandoing their cart. I.e. they didn't start checkout so there is no email address available.
Enter email adress before last part a payment and they quit a site. i want to sent them.
in basket have unregistered users log. customers must be entered email adress if want to buy
And sorry i use 4.3 and 4.5 this feature only see 4.5 te. i see the email adress in basket.