I've discussed this with my ISP. The reason codeguru.com emails are being marked as spam is because they contain an advert (http://tinyurl.com/c6t2f9k). My ISP has now reset the spam filter for the codeguru domain so these emails are no longer being marked as spam. If other members are getting the same issue with codeguru.com emails being marked as spam, the advert is probably the reason.
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