Please just don't. It's ridiculously childish. I have a friend who does this and I'm embarrassed to be seen with him when he does it.
Just win, or lose.
Repeat.
Wow! It seems that umm, everyone sends mail. Good lord.
When I was playing COD I never saw a single message. But in Destiny we are sending messages all the time. Wonder why that is.
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I just block them and move on. I have enough to deal with in my own fireteam as they scream about lag, cheaters, op weapons, ruined weapons, broken subclasses, endgame 297 rare boot drops etc without dealing with messages from the opposition screaming about the exact same shite.