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Sunday, November 10th, 2024 1:31 PM

552 5.2.0 Prohibited by policy

HI,

Need a support on Email got blocked by comcast ISP. Yesterday evening we have sent an email with attachment of 10MB in size. And we got a block error.

     

" The comcast.net server blocked this message from being delivered. While we won't try to send this message again, we will attempt to send new messages to this address in the future."
                      
                  
The error that the other server returned was: 552 5.2.0 Prohibited by policy

What is happened suddenly Please advise on the same.

Thanks & Regards

<Edited: "Personal Information">

Expert

 • 

29.6K Messages

5 months ago

Call Comcast security. They handle any blocking issues-----------------------

Comcast Customer Security Assurance-------------------

Normal business hours (6:00 am to 2:00 am EST, 7 days a week) 1 - 888-565-4329

1 Message

4 days ago

Did you ever get resolution on this?  if so, what was it.  Started happening to me yesterday and cant get an answer. thanks

Official Employee

 • 

1.3K Messages

 

user_38i8jh One of the experts posted the security teams number that helps with these issues on this thread. They can help. 

 

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

1 Message

3 days ago

Same here. Anything that can be done to fix?

Official Employee

 • 

2K Messages

 

francelmazaj Hey there! Did you try contacting our CSA team

 

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

1 Message

12 hours ago

I recently had a similar issue with godaddy providing a Office365 email - all emails to comcast.net users resulted in 552 5.2.0 Prohibited by policy. GoDaddy support was of no help and just pointed the finger at comcast. Comcast indicated that it's GoDaddy's issue... turns out the domain parked at GoDaddy is likely not publishing the DMARC records and not using DKIM and SPF authentication. I had to manually go into the DNS config in the GoDaddy domain profile and add additional TXT and CNAME records to make this work again.

https://learn.microsoft.com/en-us/defender-office-365/email-authentication-dmarc-configure
https://security.microsoft.com/dkimv2

once the correct records are in place you can test the domain is setup correctly with https://mxtoolbox.com/

figured it out from this link:
https://www.reddit.com/r/sysadmin/comments/1akbsht/setup_dmarc_dkim_and_spf_in_microsoft_365/?rdt=49320

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