Comcast email servers BLACKLISTED

Our users are unable to email users that use Network Solutions servers for thier mail.  (They do not reply and user does not recieve)

It looks like Comcast servers with the following ip's are blacklisted on LASHBACK :

76.96.107.71

76.96.107.72

76.96.107.73

Any Help would be appreciated.

Thanks,

--Sean

When a system is blacklisted it has to be handled by the company that owns the server/IP.

The IP's I listed belong to Comcast and Comcast only.  This is not an ip that we use specifically, but our mail does pass through it (I pulled them from a message header and found them listed).  This will affect any company that is on Comcast Business and mail passes through these servers and the destination email server uses the LASHBACK blacklist.  Comcast needs to work with the company that is blacklisting them as the problem could be directly with the server or any of the many comcast business customers.  If it were mine I would have fixed it myself.

ips that are on the blacklist:

omta01.potomac.co.businessclass.comcast.net

76.96.107.71

omta02.potomac.co.businessclass.comcast.net

76.96.107.72

omta03.potomac.co.businessclass.comcast.net

76.96.107.73

Here's a helpful tool that show's they are blacklisted. 

http://mxtoolbox.com/SuperTool.aspx?action=blacklist%3a76.96.107.71&run=toolpage

That link you provided is not a Comcast customer and has no affiliation with Comcast to the best of my knowledge.

However, If you have any issues with Comcast blacklist please use http://www.comcastsupport.com/rbl for assistance.

What are you talking about?  The link I provide is a tool that allows you to check ip/domain names against multiple blacklist sites. I don't think you understand the fundamentals here.  You should probably only attempt answer questions that you understand.

The link that you provided has nothing to do with Comcast email servers being blacklisted.  Comcast is not blacklisting itself, it's being blacklisted.

Comcast is the administrator of the IP's I provided that are being blacklisted.  They need to take care of it.

I was hoping that this would catch the attention of a Comcast Administrator and that they would understand the ramifications.  I guess I was wrong.

It's still Blacklisted, I'm not sure why someone marked any of the above comments as a solution.

Hello Sean,

We have engaged our Security Assurance team to assist with this issue.

Thank you for bringing it to our attention.

Having the same issue and clients are not receiving important messages. Blacklisted on Lashback, Nixspam, and Sorbes Spam.

IP Address: 76.96.107.73

We are having problems receiving e-mails from a couple of our clients due to blacklisting of a couple of Comcast's mail servers:

• 69.252.207.37 is also listed on Lashback and Backscatterer
• 96.114.154.163 is listed on Lashback and UCE Protect

Whose job is it at Comcast to:

1. Crack down on your customer's e-mail use to ensure your own server's don't get listed (affecting large swaths of your customer base), and
2. Audit this list of e-mail servers on a fairly regular basis using a tool like MX Toolbox to check for IPs that have been blacklisted and request removal?

For a company of Comcast's size, I'm a bit surprised this is even a problem...