We had issues and similar behavior from SORBS.net and TrendMicro ERS but have never dealt with Spam Rats. It was our second direct allocation from ARIN last year that was apart of a larger block that got split up. Our block was listed in their DUL. It was a pain to remove. They wanted our PTR records to say "static" and provide a longer TTL. Others on this list have shared similar stories. This is crazy but it's their service and seem to be a common practice amongst some RBLs. I hope you get your issue fixed. FYI - I have a PTR for all IPs. Just general practice. Otis -----Original Message----- From: Julian DeMarchi [mailto:julian@jdcomputers.com.au] Sent: Wednesday, January 09, 2013 8:59 PM To: NANOG Subject: [SHAME] Spam Rats Heya, I don't like to publicly shame[0] companies or services but today I have found a need too. There is an anti-spam company called Spam Rats[1]. They provide an RBL service and today is the first time I've seen them. So thank god they seem to not be used much. I'm emailing this list to advise of their listing pratices. They have listed a /24 of my companies for lack of PTRs in the range. Yes. Lack of PTRs in the /24 range. This is for co-lo customers. The range has a netural score on senderbase. This is the first RBL I have seen list a /24 for lack of PTRs. Not for sending spam, but just PTRs alone. How do you explain this to your customer? Their removal process is also a joke. As we are "mass-listed" the normal removal process does not apply. I've used their contact form but doubt I'll get a response. Please make 2013 the year you migrate away from Spam Rats if you choose to use this service[2]. Regards, Julian 0 - is ready to get flamed. 1 - http://www.spamrats.com 2 - these are my opinions only