Reputation Filtering Rejecting a valid Host

We have a company that is not able to email us. Our ironport server says their reputation status is poor and is rejecting the message.
If you go to senderscore.org and enter the ip addresses of their server they are all 95-100 score rating.
Why are we rejecting their email?
I was able to get around this by add them to the whitelist.

this host is a 'poor' score for a reason - whether it's quasi-legitimate spam / marketing mail or a sharp statistical increase in mail volume over a short period due to some bot net or virus traffic - there's not supposed to be any misinformation or false positives. there are many reasons or factors that contribute to the score, which is mostly confidential for us (IronPort). we can tell you that it is a rolling average that is continuously correcting itself.
many cusgtomers are comfortable referring their partners or owners of incoming MTAs that have been rejected by SBRS to just RTM at senderbase.org and contact SB support teams for more info.
so in short, if you 'trust' this MTA and they don't want to contact SenderBase for help, then yes, manually add it to the whitelist. occasionally whitelisting is easier than constantly blacklisting, which is why senderbase is so cool / popular.
more info on senderbase.org and our 'Sender Base Reputation Score':
Sender Base Best Practices / Overview:
http://tinyurl.com/lvuub
Tips on Low Scores:
http://tinyurl.com/zfczg
andrew

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