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've never had one, thankfully. Did get one very abusive message on black ops one back in the day, from a guy who had a gamertag like "death2campers" and a profile pic of a tent with a cross over it, calling me all sorts of lovely things. Just reported him and ignored it. [spoiler] genuinely wasn't even camping[/spoiler]