My postman mostly brings me junk mail, that I throw directly into a bin next to my building's mailboxes rather than bring it up to the apartment. That's not his

My postman mostly brings me junk mail, that I throw directly into a bin next to my building's mailboxes rather than bring it up to the apartment. That's not his fault, of course. There's no mechanism for me to tip him on any regular basis, unlike the delivery apps that let me add a tip to my credit card payment.