[rndgermandude]

I can still remember the message (or at least important bits) and can write it down when at home or tell it to other people.

[wyxuan]

Yeah but it is still a helluva lot harder to leak it, and it isn't as good as showing an email exchange.

[rndgermandude]

Sure it's harder, and it will not stand up in a court of law probably. But there probably have been and still are a ton of spies, national and industrial, who do exactly this, memorize things.

[maciej]

for now

[mc32]

Well, presumably most communication is two way or actionable. If not, then there is no reason for the communication in the first place.