Todd, you might want to check SenderBase. We had a similar issue a month ago. SenderBase had recorded a number of backscatter messages from a private list we host that often gets attacked by spammers. The unauthorized access notices that were sent back were seen as backscatter by SenderBase and they reduced our rating from Good to Poor. IronPort filtering devices use the SenderBase rating as one of their blocking criteria, so we were blocked from sending to mail servers protected by IronPort.
Fortunately there were only a handful of our customers affected, we rerouted mail temporarily, and we were upgraded in SenderBase two days later after adding filtering to that hosting account. Matt Bramble pointed out to me another site, SenderScore.org, that you might want to watch as well. I'm planning to set up monitoring on these sites as an additional detection of delivery problems. Darin. ----- Original Message ----- From: Michael Graveen To: declude.junkmail@declude.com Sent: Saturday, May 16, 2009 7:54 AM Subject: re: [Declude.JunkMail] BackScatter I think Greylisting reduces backscatter. Greylisting stops the majority of the SPAM from ever reaching our mail server, so it never has a chance to get bounced back because of a non existent user, etc. Mike -------------------------------------------------------------------------------- Hi Everyone - We've been having a few issues with mail servers refusing our mail. Today I ran a test on DNSStuff and found that our IP is on BackScatter.org. They are referencing an event on 4/27, and supposedly we will be removed after 4 weeks if they haven't had any other issues. Of course we can pay to have it removed sooner. I'm not sure if being listed in their DB is the main culprit to the server refusals that I've seen? We switched over to SmarterMail in mid-April. Since 4/27, we have implemented grey listing. Is grey listing a good first line of defense? Is there anything else I should be doing to prevent back scatter? Thanks for your thoughts on this. Todd --- This E-mail came from the Declude.JunkMail mailing list. To unsubscribe, just send an E-mail to imail...@declude.com, and type "unsubscribe Declude.JunkMail". The archives can be found at http://www.mail-archive.com. --- This E-mail came from the Declude.JunkMail mailing list. To unsubscribe, just send an E-mail to imail...@declude.com, and type "unsubscribe Declude.JunkMail". The archives can be found at http://www.mail-archive.com. --- This E-mail came from the Declude.JunkMail mailing list. To unsubscribe, just send an E-mail to imail...@declude.com, and type "unsubscribe Declude.JunkMail". The archives can be found at http://www.mail-archive.com.
