On 9/8/2016 5:31 PM, KYW wrote:

Some arrangement where the gate looks like its chained but
in fact isnt and which doesnt require the postman to do anything
at all except realise that it isnt chained should work well.

We have an old lock hanging on the gate - it _looks_ like the gate is
locked, but it isn't.
In fact it looks _so_ locked, that I've had cousins climb over the fence
to get up to the house...
The postie has no trouble with it.