It seems my emails are eventually filtering through. My daughter Laura received one of the four emails I sent her three days after it was sent. Even the Post Office can delivers faster than that. One email I sent to two people arrived in one inbox but not the other. So it is hit an miss at the moment.
Somewhere in Cyberspace there must be a virtual depot where unsent emails are kept. This high tech warehouse probably has thousands of emails all waiting to be re-transmitted to the rightful owners. I imagine it is a bit like the airport baggage reclaim lounges which have stacks of cases waiting to be re-directed to the right airport.
Sometime in the future Laura will receive all the other versions of the same message with notes explaining why they weren't delivered on time.