Yesterday Morning my office, using Exchange 2003, started getting bounce backs with emails we sent out. Not every email but probably 40-50% of them.
on 10/17/2013 5:57 PM
You do not have permission to send to this recipient. For assistance, contact your system administrator.
<fosterthomas.com #5.7.1 smtp;550 5.7.1 Service unavailable; Client host [126.96.36.199] blocked using Spamhaus Blocklist, mail from IP banned; To request removal from this list see http://www.spamhaus.org/query/bl?ip=188.8.131.52
So I go to the link at spamhaus and request to be removed, and we are taken off the list, then a few hours later we are put back on the list and i have to do it again.
They have this Norton Tool as a recommendation
I have run that on both servers and every client computer, and removed anything it found. However we are still being marked as Spam and I have no idea what else to look for. Any ideas?