Undelivered Mail Returned to Sender

Hey, I’m getting something along the lines of the following everytime I try to send an e-mail to 1 specific domain? What can I do to fix this?

Undelivered Mail Returned to Sender
From: “Mail Delivery System” MAILER-DAEMON@looneymail-a1.g.dreamhost.com
Date: Mon, May 24, 2010 7:47 am
To: email@domain.com

This is the Postfix program at host looneymail-a1.g.dreamhost.com.

I’m sorry to have to inform you that your message could not be
be delivered to one or more recipients. It’s attached below.

For further assistance, please send mail to

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                    The Postfix program

EMAIL@DOMAIN.COM: host domain.net[666.666.666.6] said:
557 Your IP is currently listed in SpamFilter ISP’s
Distributed Blacklist. Please see http://www.logsat.com/SFDB/why.asp for
details. (in reply to end of DATA command)

I could help you if you could give me the domain your trying to mail to.

There’s your problem. It looks like the receiving mail server is blocking mail from looneymail-a1.g.dreamhost.com (IP address: due to viruses and/or spam coming from that IP. That’s one of the pitfalls of shared hosting. Contact DreamHost support and see if they can stop the offending costumer from spewing junk. According to http://www.logsat.com/SFDB/why.asp, once the flow of junk stops for 24 hours, the IP will be removed from the blacklist, and the server should accept your mail.