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Bytejournal
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Tuesday, February 4th, 2025 5:04 PM

Unable to reach comcast.net email addresses

I operate several mail servers that are being soft-rejected by Comcast with the following error:
~~~
421 resimta-h2p-561937.sys.comcast.net resimta-h2p-561937.sys.comcast.net ESMTP server temporarily not available
~~~

We have good rDNS in place and are about as spam-free as possible, but messages are still rejected. I've sent numerous emails to Comcast Abuse, Comcast Postmaster, etc. - all of which have gone unanswered. Is there anyone at Comcast who can help with this?

Thanks!

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Updated 

2 months ago

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XfinityJamesC

Official Employee

 • 

2.1K Messages

2 months ago

Greetings, @Bytejournal! I hope your week has been treating you well. Thanks so much for taking a moment out of your busy day to leave a post on our community forum. I'm sorry to hear your mail servers are having issues with Comcast email addresses, but you have definitely come to the right place for assistance.

 

I would recommend reaching out to our Customer Security Assurance (CSA) Team to see if there are any blocks or known issues with your IP address. You can find them online at https://internetsecurity.xfinity.com. You can also reach them by phone at 1-800-266-2278 or 1-800-934-6489 between the hours of 8am and 12am, 7 days a week.

4

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Bytejournal

3 Messages

Hi James, I spoke with the CSA team half a dozen times as recently as this morning, and they just can't seem to understand the problem. Is there anyone based in the US that I can explain this to & send our logs to? The offshore CSA team simply isn't equipped to assist with this problem.

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2 months ago

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XfinityJamesC

Official Employee

 • 

2.1K Messages

Thank you for clarifying, @Bytejournal. I think the best course of action would be to go online and select the "Report a Blocked Website" tab. That will open up a new window with a dropdown containing an option for "I'm not able to send e-mail to Comcast customers (comcast.net)." From there, you can fill in the details and submit a formal report.

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer.tick
I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer.tick

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2 months ago

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Bytejournal

3 Messages

We tried that at least half a dozen times, but we always receive a report stating the IP in question isn't being blocked, which is true as we don't receive a traditional bounce message when emailing comcast.net users -- we simply receive a "temporarily not available" error. Can you help us find the right team within Comcast to discuss this with? I would be happy to provide the exact bounce messages, sample emails, to/from addresses, and anything we need. The CSA team is telling us to have our 10,000+ customers call Comcast one by one for assistance with this, which simply isn't feasible. We have hundreds of IPs affected by this problem, which is causing a service disruption to over 10,000 customers of our hosting service. Anything you can do to assist would be greatly appreciated.

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2 months ago

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XfinityRoberto

Official Employee

 • 

1.7K Messages

Hi there, thank you so much for your patience! I am sorry to hear that you have not been able to get no assistance with our CSA team. I would like to see what we can do for you here. 

Please send us a direct chat message with your full name and complete service address to “Xfinity Support”. To do so, click on the chat icon located at the top right of this forums page.

Here's the detailed steps to direct message us:

  • Click "Sign In" if necessary
  • Click the "Direct Message” icon (upper right corner of this page)
  • Click the "New message" (pencil and paper) icon
  • Type "Xfinity Support" in the to line and select "Xfinity Support" from the drop-down list
  • Type your message in the text area near the bottom of the window
  • Press Enter to send your message

 

Let me know if you have any questions.

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer.tick

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2 months ago

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