[165698] in North American Network Operators' Group
Re: The block message is 521 DNSRBL: Blocked for abuse
daemon@ATHENA.MIT.EDU (Carlos Kamtha)
Wed Sep 18 20:38:04 2013
Date: Wed, 18 Sep 2013 20:38:08 -0400
From: Carlos Kamtha <kamtha@ak-labs.net>
To: NANOG <NANOG@abcsupply.com>
In-Reply-To: <3CD2C55A8CD6E74EB451AC934C8CCD319EA4C742@MBLocal02.abcsupply.com>
Cc: "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Quite unfortunate..
These days, when allocated 'new' IPV4 space you really have to do a little =
homework to make sure it 'clean'.=20
I would suggest that you run your CIDR block through http://multirbl.valli.=
org/lookup/.=20
IF it's mostly clean and not on hardcore lists such as SpamHaus ROKSO, then=
there's hope.=20
Whatever lists your netblock is on you will just have to contact thier abus=
e dept. and explain your predicament and
stay on top of it.
Sounds like you are well on your way to doing that..=20
Good luck.=20
Carlos.=20
On Wed, Sep 18, 2013 at 04:07:25PM +0000, NANOG wrote:
> We recently purchased new IP addresses from ARIN, with plans on using one=
of them for our external and internal email delivery. We set up a reverse=
lookup and a SPF record for the newly purchased IP to prevent being classi=
fied as spam. We tested the functionality of the PTR and SPF record succes=
sfully using varies internet tools like dnsstuff.com, mxtoolbox.com, and ki=
tterman.com. Unfortunately, when we send emails to any AT&T or Network Sol=
utions hosted email we are being block as a spam abuser. I checked varies =
spam database tools and our IP addresses are not listed, but we are still b=
eing blocked by both AT&T and Network Solution. The block message is 521 D=
NSRBL: Blocked for abuse. In an attempt to be proactive, I contacted Netwo=
rk Solution and was told that each recipient would have to request we be wh=
itelisted, and AT&T directed me to an online form that I submitted to be re=
moved from the blacklist. Unfortunately, we are still not able to send ema=
ils to either AT&T or Network Solutions hosted emails. Our mail server IP =
address is 74.112.99.25, which resolves to mail.abcsupply.com. Does anyone=
have any suggestions on where to turn next? Is it possible they are block=
ing us based on old information from the previous IP address block owner? =
Any help tracking this down would be appreciated.
>=20
>=20
> Derrick Wash
> Microsoft Systems Administrator
> ABC Supply Company Inc
> Office: (608)368-2214
> Fax: (608)363-0214
