Our Gateway IP is Blacklisted by the Chile DNSBL

I received a warning from MXToolbox that our Gateway IP is Blacklisted by the Chile DNSBL.

Instructions on requesting delisting from Chile DNSBL can be found at : http://www.dnsblchile.org/eliminar.html

More information about Chile DNSBL can be found at their website: http://www.dnsblchile.org/

Reason for listing - rango DUL confirmado por dnsblchile.org

In order to request de-listing one needs to register an IP administrator (http://www.dnsblchile.org/registrar.en.html). When I filled up the form, their server complains that I am not the Administrator...

In their page they post:

Whomever uses this form must be the administrator of the IP
(Clients of an e-mail service must ask their service to delist an IP)

I guess they see our IP as Dynamic? Or we do not have a setting correct?

Please advise

Responses

Accepted Solution

Comcast_Jon

Administrator

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1.5K Messages

11 years ago

Hello DinoGr,

Welcome to the forum.

To assist we have engaged our security team for this issue.

Thank you

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Accepted Solution

jborchart1

New Member

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2 Messages

11 years ago

I had the same mesage from mxtoolbox. Here is what happend:

Comcast Business users without a static IP address are required to use a Comcast SMTP gateway, or some other commercial gateway, when sending SMTP traffic out directly from their site. This has been the case for many years.

What this Chile DNSBL did was to copy the Comcast address range into their list, which is right and proper for them to do. This isn't because of anything Comcast did that I can figure out.

So, this is actually a good thing, because if any infected PC at your site starts sending out SMTP email directly, it will get blacklisted right away and will never make it to the recipients.

If you have a STATIC IP address on Comcast, then you should not be blacklisted.

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Accepted Solution

Comcast_Jon

Administrator

•

1.5K Messages

11 years ago

Hello jobrchart1,

Thank you for your informative post, the community appreciate it!

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Accepted Solution

Mkc451

Visitor

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3 Messages

11 years ago

I have exaclty the same problem since the 25th -- they are blocking 173.xxx.xxx.xxx-michigan.hfc.comcast.business.net. We have a five static address contract. This whole chile dnsbl this is getting to be a PIA ... I have searched and found this has been a problem for comcast for a while. Since I have my own domain & statis addresses, I don't know why this ip address reports out to comcast.business.net for email. My MX record is not comcast.business. For some reason they are seeing it as this.

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