angelsix's profile

Contributor

 • 

53 Messages

Wednesday, April 23rd, 2025 5:41 PM

Security Certificate that cannot be verified for Outlook classic -- POP3

Whenever I open MS Outlook, I get an error message, "Internet Security Warning" related to all of my Comcast email addresses.  This doesn't affect my other email accounts (gmail.com, outlook.com, mail.com).

It's not a huge issue, just really irritating, since all I have to do is to click "Yes" and my Comcast emails appear.

A user named "Electrum" posted a thread about this problem, including the related windows of this error message at:  https://forums.xfinity.com/conversations/customer-service/security-certificate-cannot-be-verified/62171ec980db9c3cdd5e9818 3 years ago.  All he ended up getting was being told to make a phone call for technical support.  Somehow, it seems to me, we should be able to do better than that, since I'm still having exactly the same issue.

I have my mail set up as POP3.  For some reason Outlook is accessing an IMAP certificate, which does seem problematic.  Both Comcast/Xfinity and Microsoft claim that users are welcome to use POP3.  Is the problem really that Comcast/Infinity and Microsoft have decided to coerce us into switching to IMAP by just making POP3 inconvenient?

Help?

Official Employee

 • 

1.4K Messages

4 hours ago

Hello angelsix. Thank you for reaching out to us and doing your leg work investigating this continuing error when accessing your comcast.net email address with outlook. I'm sorry that you have this warning each time you open outlook. I know first hand that pop3 email client settings are still supported since I use them for my own comcast.net email address. With the application loading an imap certificate I am curious if part of the problem may be that there is a partial imap setting within the mail server settings of outlook. 

Would you mind checking if you have these settings in outlook please?

  • Incoming Mail Server Name: pop3.comcast.net
  • Incoming Mail Server Port Number: 995 (POP3 with SSL)
    • Incoming Mail Server Port 110 is no longer supported.
    • Make sure to use port 995 instead.
    • You can check this in your email program's SettingsAdvanced Settings or Preferences menu.
forum icon

New to the Community?

Start Here