Yep, don't take it personally. I've gotten those sort of mails before too and, as annoying as it is, it's just someone venting some frustration. As long as they're not aggressive or overly rude, there's not really a problem.
In all honesty, I've sent NMs to people who have seemingly quit on me too. Just saying that it's not worth playing and then quitting as they get nothing, whereas if they actually finished the game, at least they'd get a few NP and items. I don't block them if I've mailed them though. A couple actually apologised, in fact.
http://www.neopets.com/browseshop.phtml?owner=triciaroo
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http://www.neopets.com/browseshop.phtml?owner=triciaroo
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Target date: 16th September 2012
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