Need buyer email address for tracked international shipping

l am in the UK and l have got an order from France. To send tracked, all services require the buyer’s email address. Amazon’s order only includes the phone number, however. I can send a message to the buyer, but it is prohibited to include email addresses in the correspondence — so even if they respond with their email address, it will be automatically scrambled. Thus, l am unable to ship.

What could l do to overcome this problem? Shouldn’t Amazon start including the email address as a standard feature?