> the letter proved that I posted myself something on a given date This is where the notary angle kicks in. Notary records will prove the date (2nd proof of da

> the letter proved that I posted myself something on a given date This is where the notary angle kicks in. Notary records will prove the date (2nd proof of date, btw) as well as the content. (Strict legal angle apart, I think this simplistic method packs a lot of sophistication!)