We will always tell you at the point of booking if a phone number or email address is required or not.
Most couriers need a phone number for the receiver, so they can contact them in case there are any delivery issues.
Most couriers do not insist on the recipients email address but we strongly recommend you providing it, as it can help reduce delivery delays and issues, and also lets us keep the recipient up to date about the delivery.
We never share data with anyone else.