Why LEAT sometimes cannot confirm a letter arrived

LEAT records what actually happened to something it sent. Sometimes that is "nobody knows", and it will say so.

The three different things

• Sent means somebody handed it to the post, a courier or an email system, and recorded the receipt.
• Delivered means the channel reported it arrived. A courier scan, a delivery report, a signature.
• Unknown means the channel gave no usable answer.

Why an unknown stays unknown

An unknown does not become a delivery after a week. Somebody has to find out, by asking the courier or checking a receipt, and the record only changes when they do.

The alternative would be a system that eventually reported a notice as delivered because enough time had passed, which is a thing LEAT would then have said in a legal proceeding.

Why LEAT will not simply send it again

Sending a second copy of a formal notice is not free. It can create a second legal effect, and it can look like the first one was withdrawn.

So an unresolved send is investigated rather than repeated. If a second copy is genuinely needed, somebody decides that deliberately.

What a delivery confirmation proves

That the specific event happened: a courier scanned it, a mail server accepted it, somebody signed for it.

It does not prove who read it, that they understood it, or that it counts as legal service. Those are separate questions and LEAT does not answer them from a delivery report.