> Isn't the content of the letter still subject to debate? Yes. I'm not a lawyer, (like at all :D) but I used to work admin for a lawyer's office during high s

> Isn't the content of the letter still subject to debate? Yes. I'm not a lawyer, (like at all :D) but I used to work admin for a lawyer's office during high school as a summer job. As a matter of procedure that office kept a hard copy of every outgoing certified letter and a continuously numbered ledger with metadata about the outgoing letters. Presumably in case of a dispute these would be used as evidence. And yeah notary public is an other option. Obviously it is more expensive so only used when it is necessary. Lugging papers to the notary public and waiting for my turn, getting them processed and then carrying them back to the office was one of my tasks.