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 personally see more hate mail in raids, especially if I have to kick someone for being disruptive. Thankfully Microsoft do issue bans if you report it to them.