Have you read Avogadro Corp (http://avogadrocorp.com/ )? That novel is based on the premise of a tool that is intended to help you write well-crafted emails yet quickly gets out of hand.
I'm not suggesting at all this will be the case here but this seems related and might be an interesting read.
My second thought was the Cory Doctorow story which predicted that the first true AI will be the result of a machine learning spambot and a machine learning antispam bot getting stuck in an arms race.
This tech would make for an excellent means for spammers and malware authors to bypass spam filters easily.
1)Infect user.
2)Generate new content based on old emails.
3)Infect everyone.
4)Repeat.
Never read it, but I just looked it up and will order it soon. Gotta make sure we don't make the same mistakes ;)
Definitely not something we're going after, haha!
I'm not suggesting at all this will be the case here but this seems related and might be an interesting read.