I've seen Edwardian postcards from the days of several collections/deliveries informing recipients of the senders visit later the same day!!
Makes you wonder what they had then to have such a good service - no fast cars, high speed trains, jet aeroplanes or automated sorting machines
Jumping in here a bit late - but when I was a child (and, no, it wasn't in the Edwardian era!) there were three deliveries a day, the last being around 4 pm. If you posted a letter, say, in Edinburgh before 8 am to somebody in another part of the city, it would be delivered that afternoon. And, I may say, the deliveries were regular as clockwork - 8 am, noon and 4 pm.
Now it's just pathetic. I got a letter post-marked 29 March which reached me on 12 April, advising me of a hospital appointment on 11 April - and I'll get slapped for being a "Did Not Attend"!
I just don't get it because fewer people write letters these days thanks to emails.