Why do some emails have [FFML] and some don't?

('kay you can kill me now.... AAAAaaaaa <duck and cover!> ;])
							Martha (and cat)
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<A Bear's Tears> <Ace of Spades> <As The Fur Flies> <Black Obsidion>
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Come in Peace, Shoot to Kill!> <Wild Country> <Your Mother's a Hampster!>