How to kill message buffer when message is sent out

[leon]

Hi guys,

I try not to close emacs as much as possible in my laptop. I found out
that there are tons of message buffers left which seems annoying since I
almost sure I'll never need the buffer again.

What can I do with this?

Thank you.
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.     *                                       .
.    /.\  excuses are the easiest things      .
.   /..'\     to manufacture                  .
.   /'.'\   and the hardest things to sell    .
.  /.''.'\                                    .
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. ^^^[_]^^^                                   .
.                                             .
.Leon                                         .
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