Re: [mailop] [EXTERNAL] Comcast contact - IPv6 routing issue?

[Brotman, Alex via mailop]

I'll reply off-list as well, see if we can get some additional information.


From: mailop  on behalf of Jay Hennigan via mailop 

Sent: Friday, December 17, 2021 7:18 PM
To: mailop
Subject: [EXTERNAL] [mailop] Comcast contact - IPv6 routing issue?

Very small discussion list seeing bounces from Comcast. We are sending
with IPv4 but bounce looks like an IPv6 network problem. Error message
is as follows: (recipient usernames redacted). Can someone look into
this or contact me offlist? Thanks!


Final-Recipient: rfc822; x...@comcast.net
Original-Recipient: rfc822;x...@comcast.net
Action: failed
Status: 4.4.1
Diagnostic-Code: X-Postfix; delivery temporarily suspended: connect to
 mx2h1.comcast.net[2001:558:fd02:243f::3]:25: Network is unreachable

Final-Recipient: rfc822; xxx...@comcast.net
Original-Recipient: rfc822;xxx...@comcast.net
Action: failed
Status: 4.4.1
Diagnostic-Code: X-Postfix; delivery temporarily suspended: connect to
 mx2h1.comcast.net[2001:558:fd02:243f::3]:25: Network is unreachable

Final-Recipient: rfc822; ...@comcast.net
Original-Recipient: rfc822;...@comcast.net
Action: failed
Status: 4.4.1
Diagnostic-Code: X-Postfix; delivery temporarily suspended: connect to
 mx2h1.comcast.net[2001:558:fd02:243f::3]:25: Network is unreachable


--
Jay Hennigan - j...@west.net
Network Engineering - CCIE #7880
503 897-8550 - WB6RDV
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Re: [mailop] [EXTERNAL] Comcast contact

[Mike Reed via mailop]

Hi,

Thank you both Keith and Alex for your replies. I am very grateful.

Kind regards,
Mike

>
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Re: [mailop] [EXTERNAL] Comcast contact

[Brotman, Alex via mailop]

Mike,

Feel free to reach out to me, I'll see how we can help


--
Alex Brotman
Sr Engineer, Anti-Abuse & Messaging Policy
Comcast


From: mailop  on behalf of Mike Reed via mailop 

Sent: Saturday, April 10, 2021 9:22:38 AM
To: mailop@mailop.org 
Subject: [EXTERNAL] [mailop] Comcast contact

Hi,

Do we have any readers from Comcast? I opened a ticket with the abuse desk on 
the 7th about some unwanted traffic and I've heard nothing.

Kind regards,
Mike
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Re: [mailop] [EXTERNAL] Comcast contact?

[Keith Kouzmanoff via mailop]

I can't say enough positive things about the comcast postmaster team. 
They have provided quick response to issues and with this tiny 
information I was able to identify an ESP having several bad actors. 
When I approached the CEO, he said "I can't kick them off I already 
cashed the checks."


This enabled me to tell the client "I don't want to be a part of 
supporting that practice."


I love the response a team member gave me which sealed the deal, "Do 
with this information as you please"


That's all I needed.

---

keith kouzmanoff


On 8/13/2019 12:09 PM, Brotman, Alexander via mailop wrote:


Brett, I can take a look at this.  Is that the only IP?

--

Alex Brotman

Sr. Engineer, Anti-Abuse & Messaging Policy

Comcast

*From:* mailop  *On Behalf Of *Brett 
Schenker via mailop

*Sent:* Tuesday, August 13, 2019 12:18 PM
*To:* Aaron C. de Bruyn via mailop 
*Subject:* [EXTERNAL] [mailop] Comcast contact?

We're warming up some IPs and one we're getting the response below but 
there's no Zen listing (which is what the error code indicates). So 
was hoping to chat with someone to figure out what may be the cause of 
this and get it resolved.


1565711881@BD/30-27744-70ED25D5@BD/30-27744-70ED25D5@66/AA-27744-25D5@p...@comcast.net@0@mailoutgroup009@mailout933@12@0@1.00@68.87.20.5@554 
 
resimta-ch2-05v.sys.comcast.net 
 
resimta-ch2-05v.sys.comcast.net 
 192.133.16.43 found on one or 
more DNSBLs, see 
http://postmaster.comcast.net/smtp-error-codes.php#BL01


[root@ASV11MTAM001 ~]# date -d@1565711881

Tue Aug 13 11:58:01 EDT 2019

--

Brett Schenker
Man of Many Things, Including
5B Consulting - http://www.5bconsulting.com 

Graphic Policy - http://www.graphicpolicy.com 



Twitter - http://twitter.com/bhschenker
LinkedIn - http://www.linkedin.com/in/brettschenker


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--
---

keithkouzmanoff
mobile   563.581.9487
twitter  @emailmp
linkedin https://www.linkedin.com/in/kouzmanoff/
skypekeith.kouzmanoff

---

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Re: [mailop] [EXTERNAL] Comcast contact?

[Brotman, Alexander via mailop]

Brett, I can take a look at this.  Is that the only IP?

--
Alex Brotman
Sr. Engineer, Anti-Abuse & Messaging Policy
Comcast

From: mailop  On Behalf Of Brett Schenker via mailop
Sent: Tuesday, August 13, 2019 12:18 PM
To: Aaron C. de Bruyn via mailop 
Subject: [EXTERNAL] [mailop] Comcast contact?

We're warming up some IPs and one we're getting the response below but there's 
no Zen listing (which is what the error code indicates). So was hoping to chat 
with someone to figure out what may be the cause of this and get it resolved.


1565711881@BD/30-27744-70ED25D5@BD/30-27744-70ED25D5@66/AA-27744-25D5@p...@comcast.net@0@mailoutgroup009@mailout933@12@0@1.00@68.87.20.5@554
 resimta-ch2-05v.sys.comcast.net 
resimta-ch2-05v.sys.comcast.net 
192.133.16.43 found on one or more DNSBLs, see 
http://postmaster.comcast.net/smtp-error-codes.php#BL01

[root@ASV11MTAM001 ~]# date -d@1565711881

Tue Aug 13 11:58:01 EDT 2019

--
Brett Schenker
Man of Many Things, Including
5B Consulting - 
http://www.5bconsulting.com
Graphic Policy - 
http://www.graphicpolicy.com

Twitter - http://twitter.com/bhschenker
LinkedIn - http://www.linkedin.com/in/brettschenker
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Re: [mailop] [EXTERNAL] Comcast contact? bounce.care.comcast.com

[Brotman, Alexander]

Carl,

You can contact me off-list with specific details if you have more information.

--
Alex Brotman
Sr. Engineer, Anti-Abuse
Comcast


-Original Message-
From: mailop [mailto:mailop-boun...@mailop.org] On Behalf Of Carl Byington
Sent: Monday, June 25, 2018 12:09 PM
To: mailop@mailop.org
Subject: [EXTERNAL] [mailop] Comcast contact? bounce.care.comcast.com

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA512

bounce.care.comcast.com has

"v=spf1 include:cust-spf.exacttarget.com ip4:76.96.68.101
ip4:76.96.68.102 ip4:76.96.68.103 ip4:69.252.76.7 ip4:69.252.76.8
ip4:69.252.76.9 -all"

Note the -all, but at least some mail is arriving here via resqmta-po- 
04v.sys.comcast.net == 96.114.154.163 not listed in the above spf record. You 
might want to fix that.

Also, the DKIM signature from mdp.comcast.net is broken - reason="signature 
verification failed".


-BEGIN PGP SIGNATURE-
Version: GnuPG v2.0.14 (GNU/Linux)

iEYEAREKAAYFAlsxE2YACgkQL6j7milTFsHZlQCfQ7i8CCsnP+Jy5R1lrFjw7A//
VyQAn3yFmOu5o/0HTCDnMUWHyH78DS48
=XKZW
-END PGP SIGNATURE-



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