Ben over at MailChimp has an article talking about a recent experience with Postini and an actual bug that causes Postini to interact badly with another spamfilter and block non-spam.
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I was told that if you take a document originally typed on an application such as MS Word and then copy and paste this into the marketing e-mail it gives it funky html code that for some reason gives your e-mail a lower score in Postini.