Does Rackspace really a spam supporter?

I am with Rackspace, they use MailMax as mail service.

When we are sending our news updates to our customers (approx. 800+ ppl/emails), some of them (like 10 to 20) got returned. And when I check the reason, it said the IP is in the black list from http://spews.org...etc

Anyone know how to fix this type of problem?

 

 

 

 

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