<HTML dir=ltr><HEAD><TITLE>Hotmail blackholing certain IP ranges ?</TITLE>
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<DIV dir=ltr><FONT face=Arial color=#000000 size=2>Jeroen,</FONT></DIV>
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<DIV dir=ltr><FONT face=Arial size=2>A quick check of those IPs shows that most don't have rDNS records. Make sure the A and PTR records for the mail server match the hostname it is using in the outbound SMTP session.</FONT></DIV>
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<DIV dir=ltr><FONT face=Arial size=2>Hope that helps,</FONT></DIV>
<DIV dir=ltr><FONT face=Arial size=2>Adam Stasiniewicz</FONT></DIV></DIV>
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<FONT face=Tahoma size=2><B>From:</B> owner-nanog@merit.edu on behalf of Jeroen Wunnink<BR><B>Sent:</B> Wed 4/25/2007 1:22 PM<BR><B>To:</B> nanog@merit.edu<BR><B>Subject:</B> Hotmail blackholing certain IP ranges ?<BR></FONT><BR></DIV>
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<P><FONT size=2>Does anyone have a clue why hotmail is appearantly blocking certain IP ranges ?<BR><BR>I provided a new server for a customer in his own IP subnet which is<BR>a part of a /20 we announce, but for some reason all mail sent to<BR>@hotmail.com addresses disappears.<BR><BR>He has another server in a /24 we announce which is still part of<BR>another network and that works like a charm.<BR><BR>None of our subnets are blacklisted in any spamfilter I can find, so<BR>i'm a bit puzzeled on what's up here.<BR><BR>If any hotmail netadmin is reading this list, can you please check if<BR>81.26.212.0/26 is blocked in any way (It's part of 81.26.208.0/20<BR>originating from AS39556)<BR><BR>According to the mailserver logs all the mail is properly accepted by<BR>the hotmail relays, never to be seen again after that.<BR><BR><BR><BR>Met vriendelijke groet,<BR><BR>Jeroen Wunnink,<BR>EasyHosting B.V. Systeembeheerder<BR>systeembeheer@easyhosting.nl<BR><BR>telefoon:+31 (035) 6285455 Postbus 48<BR>fax: +31 (035) 6838242 3755 ZG Eemnes<BR><BR><A href="http://www.easyhosting.nl/">http://www.easyhosting.nl</A><BR><A href="http://www.easycolocate.nl/">http://www.easycolocate.nl</A><BR><BR><BR></FONT></P></DIV></BODY></HTML>