<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 14 (filtered medium)"><style><!--
/* Font Definitions */
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 2 4;}
@font-face
{font-family:Consolas;
panose-1:2 11 6 9 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman","serif";
color:black;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
pre
{mso-style-priority:99;
mso-style-link:"HTML Preformatted Char";
margin:0cm;
margin-bottom:.0001pt;
font-size:10.0pt;
font-family:"Courier New";
color:black;}
span.HTMLPreformattedChar
{mso-style-name:"HTML Preformatted Char";
mso-style-priority:99;
mso-style-link:"HTML Preformatted";
font-family:Consolas;
color:black;}
span.EmailStyle19
{mso-style-type:personal-reply;
font-family:"Calibri","sans-serif";
color:#1F497D;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:72.0pt 72.0pt 72.0pt 72.0pt;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]--></head><body bgcolor=white lang=EN-AU link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>SORBS employ a similar tactic.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>They’ll pre-emptively add entire blocks to their DUHL database (dynamic user/host list) if they decide the block is used for services with dynamic IPs. If majority of the hosts are missing a PTR, or the naming convention of the PTRs suggest they’re used in a dynamic pool then that’s enough for the whole prefix to be listed.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><a href="http://www.sorbs.net/delisting/dul.shtml">http://www.sorbs.net/delisting/dul.shtml</a><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>“Generic reverse DNS naming is the most important criterion for determining if an address range should be considered dynamically assigned. Please note that entries in the SORBS DUHL never expire.”<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'>From:</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'> ausnog-bounces@lists.ausnog.net [mailto:ausnog-bounces@lists.ausnog.net] <b>On Behalf Of </b>Jake Anderson<br><b>Sent:</b> Thursday, 10 January 2013 5:39 PM<br><b>To:</b> Noel Butler<br><b>Cc:</b> ausnog@lists.ausnog.net<br><b>Subject:</b> Re: [AusNOG] [SHAME] spamrats.com<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>Everybody seems to be assuming that the OP owns the entire /24.<br>From the sound of his posting that is not the case, it sounds like he owns a handful in that range and is being punished for his "neighbors" actions, which for a "spam filter" service is just plain daft.<br><br>On 10/01/13 16:59, Noel Butler wrote:<o:p></o:p></p></div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><p class=MsoNormal>On Thu, 2013-01-10 at 13:08 +1000, Julian DeMarchi wrote: <o:p></o:p></p><pre>On 01/10/2013 01:04 PM, Paul Fraser wrote:<o:p></o:p></pre><pre>> Not that I agree with it, but I thought this was pretty much the norm as a spam mitigation technique...<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>A /32 yes. You can't block a whole /24 for no PTRs... I wouldn't be<o:p></o:p></pre><pre>running 252 mail servers on one subnet...<o:p></o:p></pre><pre><o:p> </o:p></pre><p class=MsoNormal><br>RFC 1912, Section 2.1 says every Internet-reachable host should have a name and "Make sure your PTR and A records match" and "For every IP address, there should be matching PTR record in the in-addr.arpa domain"<br><br>its DNS 101<br><br>but I agree they have taken things to the extreme IF you DID have some hosts with valid A and PTR's in that block.<br><br>Just as well they are not commonly used, perhaps this is why, just as bad a apews and a few others.<br><br><br><br><br><o:p></o:p></p><pre>_______________________________________________<o:p></o:p></pre><pre>AusNOG mailing list<o:p></o:p></pre><pre><a href="mailto:AusNOG@lists.ausnog.net">AusNOG@lists.ausnog.net</a><o:p></o:p></pre><pre><a href="http://lists.ausnog.net/mailman/listinfo/ausnog">http://lists.ausnog.net/mailman/listinfo/ausnog</a><o:p></o:p></pre></blockquote><p class=MsoNormal><o:p> </o:p></p></div></body></html>