Our regular postman is good. However, the temps that appear from time to time are appalling!
2 very recent examples :-
1) letter and small parcel ( paperback book) delivered to an obviously empty house round the corner. House has no gate, boarded up window, doorbell removed, general air of no one living there. Owner had died some months ago, house passed to daughter, not local, only visited occasionally. Temp postman put a card through our door saying " sorry, I've delivered to wrong house". We put a note through the door, but it was a couple of weeks before we recovered the post.
2) Waiting for urgent ( very expensive) medicine for our poorly cat. Had been dispatched, but not delivered to us. No red card through door or anything. Finally went to local parcel office on spec, and explained. Lady confirmed they had it, but needed the red card. Explained the postman hadn't left one, didn't make a difference. So the medicine for my poorly cat was sat on a shelf behind her, and she wouldn't give it to me, even though I could prove who I was. Had to wait for them to re-deliver the following day. ( Cat is improving, I think, but would have benefitted from starting the treatment earlier.)
The temps just don't seem to care.