if youve got a van full of parcels that all need deliverying within a specified time, do you really have the time to waste chasing someone that really should be able to hear the doorbell?
Yep, surely the job is to deliver the parcel to the customer, not a scrawled card? And what if they're a bit mutton jeff?
I don't recall the post office warning customers that if they don't answer the door within 30 secs that's it