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user_hicfbw
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Friday, June 6th, 2025 2:26 AM

My friend on CenturyLink, is trying to send me email, and suddenly she is unable to send email to me - never makes it to my Comcast inbox.

My friend on CenturyLink, is trying to send me email, and suddenly she is unable to send email to me - never makes it to my Comcast inbox. I have no email issues with anybody else. She is the only person I know with CenturyLink. Comcast seems to not like the mail relay mailchannels.net.  Can you tell me what is happening? Here is what she sees when her messages to me do not go through:

This is the mail system at host relay.mailchannels.net.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                  The mail system

<[Edited: "Personal Information"]>: host [Edited: "Personal Information"] said: 550
   5.2.0 NJonur1hxzq6uNJoouqna2 Message rejected due to DMARC. Please see


   https://postmaster.comcast.net/smtp-error-codes.php#DM000001 (in reply to
   end of DATA command)

Question

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Updated 

1 day ago

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XfinityShawn

Official Employee

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1.6K Messages

2 days ago

 

user_hicfbw  Does it show the email was sent on her end just to confirm? 

 

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user_eej9m8

Visitor

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1 Message

I'm having the same issue.  I haven't changed anything, and my friend hasn't changed anything, but all of a sudden his emails from q.com (a centurylink company) are not coming through.  He is getting that DMARC message as well.

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1 day ago

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XfinityChelseaB

Official Employee

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1.8K Messages

Hello @user_eej9m8, Thanks so much for taking a moment out of your day to leave a comment on our community forum and we would be happy to help. Please check out these links to see if that helps:

Add Email Addresses to Your Email Safe List in Xfinity Email
When friends get error messages from your Comcast email

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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1 day ago

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Hillmac

New Poster

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5 Messages

1 day ago

I have the exact same issue with a CenturyLink user - of course you  can't speak to anyone at Xfinity and doubtful they monitor this forum but here we are, hoping for service from this company. Undeliverable email due to DMARC DM000001 error message.

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XfinityAirelle

Official Employee

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2.6K Messages

@Hillmac

Thanks for sharing those details — it definitely sounds like the issue is related to how your friend’s email is being processed through their provider’s servers. The error message points to a DMARC policy failure, which means Comcast is rejecting the email because it doesn’t meet certain authentication standards.

 

Since this involves email security protocols, the best next step is to reach out directly to our Customer Security Assurance (CSA) team. They specialize in handling situations like this and can investigate the rejection further.

 

You can get started here:


https://spa.xfinity.com/help/postmaster?faq=avoid-blocks-ipv4

 

That page includes information on how to avoid blocks and how to contact our security team if they believe the message is being incorrectly filtered. Let us know if you have any trouble connecting with them — we're here to help however we can.

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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1 day ago

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