[96251] in North American Network Operators' Group
RE: Hotmail blackholing certain IP ranges ?
daemon@ATHENA.MIT.EDU (Stasiniewicz, Adam)
Wed Apr 25 14:46:42 2007
Date: Wed, 25 Apr 2007 13:43:27 -0500
From: "Stasiniewicz, Adam" <stasinia@msoe.edu>
To: "Jeroen Wunnink" <jeroen@easyhosting.nl>, <nanog@merit.edu>
Errors-To: owner-nanog@merit.edu
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Jeroen,
=20
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.
=20
Hope that helps,
Adam Stasiniewicz
________________________________
From: owner-nanog@merit.edu on behalf of Jeroen Wunnink
Sent: Wed 4/25/2007 1:22 PM
To: nanog@merit.edu
Subject: Hotmail blackholing certain IP ranges ?
Does anyone have a clue why hotmail is appearantly blocking certain IP =
ranges ?
I provided a new server for a customer in his own IP subnet which is
a part of a /20 we announce, but for some reason all mail sent to
@hotmail.com addresses disappears.
He has another server in a /24 we announce which is still part of
another network and that works like a charm.
None of our subnets are blacklisted in any spamfilter I can find, so
i'm a bit puzzeled on what's up here.
If any hotmail netadmin is reading this list, can you please check if
81.26.212.0/26 is blocked in any way (It's part of 81.26.208.0/20
originating from AS39556)
According to the mailserver logs all the mail is properly accepted by
the hotmail relays, never to be seen again after that.
Met vriendelijke groet,
Jeroen Wunnink,
EasyHosting B.V. Systeembeheerder
systeembeheer@easyhosting.nl
telefoon:+31 (035) 6285455 Postbus 48
fax: +31 (035) 6838242 3755 ZG Eemnes
http://www.easyhosting.nl <http://www.easyhosting.nl/>=20
http://www.easycolocate.nl <http://www.easycolocate.nl/>=20
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<HTML dir=3Dltr><HEAD><TITLE>Hotmail blackholing certain IP ranges =
?</TITLE>=0A=
<META http-equiv=3DContent-Type content=3D"text/html; charset=3Dunicode">=0A=
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<DIV id=3DidOWAReplyText11548 dir=3Dltr>=0A=
<DIV dir=3Dltr><FONT face=3DArial color=3D#000000 =
size=3D2>Jeroen,</FONT></DIV>=0A=
<DIV dir=3Dltr><FONT face=3DArial size=3D2></FONT> </DIV>=0A=
<DIV dir=3Dltr><FONT face=3DArial size=3D2>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>=0A=
<DIV dir=3Dltr><FONT face=3DArial size=3D2></FONT> </DIV>=0A=
<DIV dir=3Dltr><FONT face=3DArial size=3D2>Hope that helps,</FONT></DIV>=0A=
<DIV dir=3Dltr><FONT face=3DArial size=3D2>Adam =
Stasiniewicz</FONT></DIV></DIV>=0A=
<DIV dir=3Dltr><BR>=0A=
<HR tabIndex=3D-1>=0A=
<FONT face=3DTahoma size=3D2><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>=0A=
<DIV><BR>=0A=
<P><FONT size=3D2>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=3D"http://www.easyhosting.nl/">http://www.easyhosting.nl</A><BR><A =
href=3D"http://www.easycolocate.nl/">http://www.easycolocate.nl</A><BR><B=
R><BR></FONT></P></DIV></BODY></HTML>
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