[165669] in North American Network Operators' Group
Re: The block message is 521 DNSRBL: Blocked for abuse
daemon@ATHENA.MIT.EDU (Bill Woodcock)
Wed Sep 18 13:15:49 2013
From: Bill Woodcock <woody@pch.net>
Date: Wed, 18 Sep 2013 10:15:02 -0700
To: "nanog@nanog.org Operators' Group" <nanog@nanog.org>
In-Reply-To: <3CD2C55A8CD6E74EB451AC934C8CCD319EA4C742@MBLocal02.abcsupply.com>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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On Sep 18, 2013, at 9:07 AM, NANOG <NANOG@abcsupply.com> wrote:
> We recently purchased new IP addresses from ARIN
No, actually, you didn't. You were assigned the use of the addresses, =
based on need. Just as a radio station does not "purchase" spectrum.
https://www.arin.net/policy/nrpm.html#four3
> Our mail server IP address is 74.112.99.25. Is it possible they are =
blocking us based on old information from the previous IP address block =
owner?
Quite likely, yes.
John LeCoque's suggestions seemed quite sound:
> I would say the first step is to find an immediate workaround for your =
end
> users - maybe bring up a VM on AWS or some other cloud provider to use =
as
> an SMTP relay while you work out the blacklist issue. If you run into
> blacklist issues after that, you may want to take a very close look at =
your
> outbound mailflow to make sure your organization isn't sending out =
messages
> that could be categorized as spam.
-Bill
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