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Top_Notch
1st Topic

Visitor

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3 Messages

Tuesday, January 27th, 2026 7:05 PM

Email Non-delivery report received

I have been contacting the same people with the same email addresses for years, now all of the sudden, my emails are kicked back with the following message:

Your message was not delivered to its intended recipient(s) because our automated spam filtering tools recognized one or more characteristics of your message as potentially associated with spam. Our policies prohibit the transmission of spam using Comcast's platforms and services.

Why on earth would I no longer be able to REPLY to their emails? Makes absolutely NO SENSE! Nothing has changed, same email, same name etc. etc.

BEYOND frustrated!

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Updated 

2 hours ago

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XfinityJustinC

Official Employee

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2K Messages

20 hours ago

Hello, @Top_Notch thank you for reaching out over Xfinity Forums. I understand the frustration when emails aren't being delivered as intended when working previously. You can review this to see if the emails being sent are in large blocks of recipients: https://www.xfinity.com/support/articles/limitations-on-sending-email

The recipient may also have spam filters set up for their account that may flag the email: https://www.xfinity.com/support/articles/spam-filters-and-email-blocking-new-experience

If you're still having issues with email delivery, there is a great site you can visit, once there select the "Postmaster" option and there is a way to work with your Customer Security Assurance team to investigate further: https://spa.xfinity.com/help/postmaster

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Top_Notch

Visitor

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3 Messages

@XfinityJustinC​ When I am replying to THEIR email, how would that be considered spam? And it is one person or 2 people on the email, so it isn't a "large block".

They are not using Xfinity so why would Xfinity be the one blocking the email for them as spam? Makes no sense. Again, these are work associates that I have emailed back and forth several times a day for years and have NEVER had a problem until now. I email these people every single day, and now it's a problem.

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18 hours ago

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XfinityJustinC

Official Employee

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2K Messages

@Top_Notch I appreciate the update of only replying to 1 or 2 people, and not a large recipient group. Do any of the email replies contain any suspicious keywords, links, or unsafe attachments (e.g., .vbs, .scr, .bat)?  

These can be considered suspicious and flagged for possible spam. With you replying to work associates, are you connected to a VPN when replying? 

VPNs can cause issues, so wanted to see if that could be a possible culprit. 

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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17 hours ago

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Top_Notch

Visitor

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3 Messages

My email is run through Outlook. NO VPN's no suspicious activity, links phrases etc. And it is only happening with 2 people on any email I try and send them even if nothing is attached. Or if I'm just sending a simple reply that I received their email and thanking them. 

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14 hours ago

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XfinityRaf

Official Employee

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1.2K Messages

Thanks for confirming. Have you tried using a different device or sending the email through the XFINITY site and not through Outlook?

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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13 hours ago

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EG

Expert

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115.6K Messages

2 hours ago

Concern moved here to the E-mail help section.

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