When our vessels arrive to a friend`s planet/moon (in a trade mission) in the in-box messages we can read something like:

"Arrived to a planet"

My suggestion is change this message and write something similar that when this friend give us sources

" Sources have been given to a friend player"

And if we check this message would put the name of this player friend of mine.

But alternatively, why not extend the current subject from "Reaching a planet" to "Reaching a planet at [1:1:1]"

It is interesting too.