Each time i try to send email to any user at this specific domain it bounces back with the below error.
firstname.lastname@example.org on 10/19/2010 12:08 PM
You do not have permission to send to this recipient. For assistance, contact your system administrator.
<exchange.ccp.com #5.7.1 smtp;550 5.7.1 <email@example.com>: Recipient address rejected: Mail appeared to be SPAM or forged. Ask your Mail/DNS-Administrator to correct HELO and DNS MX settings or to get removed from DNSBLs; MTA helo: exchange.ccp.com , MTA hostname: 41337237.cst.lightpath.net[126.96.36.199] (helo/hostname mismatch)>