Security Certificate that cannot be verified

I already looked at the second link and the reference they posted was 2 years ago. The link in this "You should be able to use the following link https://comca.st/3IfzGMj to repair or add the email one more time." doesn't go anywhere, no good. I tried to correct the spelling of comcast in the link because of the period but it didn't help.

The first site is just information and doesn't tell me anything at all other than what is known. I have 3 other comcast emails in Microsoft 365 Outlook and they work without a problem.

Are there any other ways to check this and get this notice to stop?

@cpupro thank you for the follow up letting us know the link is no longer good, I attempted and get the same message that the link no longer exists. 

I had a quick question if you don't mind me asking, have you attempted to log in directly on our website to see if the error persists when not using the Outlook 3rd party client? 

This could help determine if it is an email issue, or the 3rd party client that could be causing the message to pop. I'm sure you have already checked the Outlook settings listed here to ensure they're set up correctly:https://www.xfinity.com/support/articles/email-client-programs-with-xfinity-email.

I don't have an issue when going to the website and logging in, terrible layout and then last thing that I will use.

Outlook from Microsoft 365 has worked perfectly for the 4 "comcast" email accounts that I have. It is only one of the emails that is giving me the trouble. ALL the emails are POP3 accounts, I want all my email in .pst files on my computer, not stored on comcast servers, don't trust them.

I will go back, delete the email that's a problem and go through this again.

I appreciate you attempting to delete and set up the email again following the link the article we gave you. Please let us know once that has been completed if you are still seeing the error message. 

Still seeing the error message. I just compared 3 comcast emails. ALL set up identically, ALL allowing 3rd party apps to use and so forth. Only the one email is having this error come up, the other two have no issues.

I also made sure that I update Microsoft 365 Outlook and any other updates that needed to be done.

At this point it looks like I'm just going to have to click on this when it pops up and say I will use the server so it goes away.

Nothing that I can see to try anymore.

Still no change, will just have to live with the issue. Why I have 3 comcast emails that work correctly and 1 that does not. ALL are working together in the same Microsoft 365 Outlook is beyond me.

ALL the emails are identical as far as the settings information to receive/send comcast emails in POP3. They have been that way for years.

@cpupro thank you for confirming the settings are identical to the others. We do have a great group of security experts that can ensure there are no concerns. The Customer Security Assurance experts can be reached online here: https://internetsecurity.xfinity.com/help/report-abuse, or over the phone at 1-800-XFINITY. 

I have the exact same issue with my new Windows 11 PC. The same settings work fine on my older Windows 10 machines.

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Hello, user_g27j35! Thanks for posting on our Community Forums. Are you still experiencing issues with your third-party email client access? Have you tried using our Xfinity App to see if the same issue persists?