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Some filtering systems have been looking at reverse DNS also on the IP of the sending server. If there is no reverse dns lookup entry then it gets a negitive score that could put it into the spam flag.
Have you looked at the headers of the message after its been processed if thats even possible as Im not fimular with the software you mentioned. If you can see the full headers of a processed message you might get an indication as to why it got blacklisted or blocked as spam.
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