In message , Chris J Dixon
writes

Their basic method of implementing opt-out is fundamentally
flawed, since it depends upon any unfamiliar staff allocated to
the route remembering my status at the time they reach my
doorstep.

That is a failure at your local delivery office, not a 'system failure'.
Anything that affects deliveries such as change of name or address, opt
outs etc. should be clearly marked in the 'slot' for your mail at the
delivery office, the whole point being that anyone on that duty will
know, not just the regular postie. Shout at the local office manager.

--
Graeme