I should probably mention that for the past 13 years I've been a system administrator at various size organisations, responsible for up to 150K mailboxes and the infrastructure to support them. It frustrates me greatly when I see misbehaving spam filters. If Postini (Google) are going to issue a 550 permanent failure, they could at least reference a web site that explains why the failure is occuring. Even a search using their own search engine comes up empty...
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