University Network all receiving CAPTCHA

Recently someone brought an infected computer on campus and it sent some SPAM before we permanently stopped it by adding a firewall rule. Shortly after, everyone on campus started receiving CAPTCHA challenges before visiting various websites. The SPAM problem has been fixed AND our reputation restored on every site we know to check, yet, 4 weeks later we still are receiving CAPTCHA challenges. We are considering a change of WAN providers to escape CAPTCHA jail. Any suggestions on how to further determine why our reputation has not improved? Our external IP is 192.190.88.226.

Thanks and have a blessed day!

Brandon.

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