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 have a friend who did something similar. Tbagged the enemy, trash talked them and even sent hate mail I think. I felt so bad, I personally took it upon myself to apologize to them for my friend's behavior.