Sending Email Problem - Emails Failing

deklinm used Ask the Experts™
Each time i try to send email to any user at this specific domain it bounces back with the below error. on 10/19/2010 12:08 PM
            You do not have permission to send to this recipient.  For assistance, contact your system administrator.
            < #5.7.1 smtp;550 5.7.1 <>: 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: , MTA hostname:[] (helo/hostname mismatch)>
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Sounds like your mail server's external IP is blacklisted, possibly due to being compromised and sending spam or relaying. Remove yourself by going here and looking up your IP:
Also use the DIAGNOSTICS function.


the results show im not on any blacklists and the only diagnostic warning is....

Warning - Reverse DNS does not match SMTP Banner

How can I fix that?
It looks like your mail server's reverse-DNS resolution is coming up as "". Have your ISP change this to match whatever your server is announcing as itself in the second line of the session transcript that begins "250 <servername>".  

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