I personally don't think there is a problem with corresponding in a formal, grammatically correct, complete manner, even in (maybe especially in) today's world. I am a lawyer, and I am frankly shocked at how informal correspondence to clients and, especially, to other lawyers has gotten. If I wrote that way when I was a young lawyer in the 1980s, one of my bosses would have given it to me the way Father Ted gave it to Bishop Brennan.