Comcast IP blacklisted by BACKSCATTERER and LASHBACK

We posted this before but somehow the thread is marked as resolve.

We have more bounces from customers, and a quick check at mxtoolbox shows Comcast IP is currently blacklisted:

http://mxtoolbox.com/SuperTool.aspx?action=blacklist%3a76.96.107.73&run=toolpage

Apparently, these two servers are fairly popular in Europe. Our customer servers rejected our emails with error "554" (blacklisted).

Responses

Accepted Solution

CC_John

Retired Employee

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1.9K Messages

10 years ago

Hi quetek. I apologize for the ongoing issues with you've encountered with outbound mail. I have re-engaged the Comcast Security & Abuse Team to resolve the blacklist issue with Comcast Server IP addresses. Our Security Team routinely checks the various list for erroneous entries and works with the list owner to correct the errors. I will update this thread with the resolution.

Thank You

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Accepted Solution

quetek

New problem solver

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31 Messages

10 years ago

More mails rejected today. web.de is a fairly big provider in German.

Reporting-MTA: dns; omta03.potomac.co.businessclass.comcast.net [76.96.107.73]
Received-From-MTA: dns; [50.254.100.58] [50.254.100.58]
Arrival-Date: Thu, 18 Dec 2014 21:03:13 +0000


Final-recipient: rfc822; xxx@web.de
Action: failed
Status: 5.1.1
Diagnostic-Code: smtp;  554 For explanation visit http://postmaster.web.de/error-messages?ip=76.96.107.73&c=bip
Last-attempt-Date: Thu, 18 Dec 2014 21:03:14 +0000

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