Don't mean to be a drag, but just asking.
Wouldn't the envelope be marked with the time stamp and not the letter itself?
Therefore its content is not ensured for proof and could possibly not be the letter of proposal.
Take what I said lightly, I was just carious. =D
As for programming journal?
Nope, possibly during my early years of learning, but they're disposable notes.
As for algorithms, I certainly keep digital backups of important pseudo designs that I've developed.
Heck, I've got scrap paper on my desk right about physics, as of this very instance...
So, I do
|jot[...] down programming notes|
, but they aren't anything qualifying to be announced as a programming journal. ^^