[Executor]

I don't usually use the in game messages, only sometimes in the begining when I don't expect much diplomacy, but that doesn't mean that it would be disregarded.
Even so, if you get a PM about a treaty that isn't much different from the in game system, just faster. You'll lose track there in a few month also, there is a limit of 300 messages max.
It makes little difference how a treaty is made, the important thing is that there is one.

I tend to write down my treaty's from various games so this doesn't happen, I suggest the same.