Server returned error "[AUTH] Temporarily blacklisted IP Address

The Customer Security Assurance site seems to need an associated error code, which is not returned with the failure:

Gmail POP3 retrieval of Comcast email returns this error: Server returned error "[AUTH] Temporarily blacklisted IP Address

This happen frequently, though Comcast email gradually seem to be retrieved between error events:

Sat, Feb 15, 2025 at 3:17 PM One mail fetched.

Sat, Feb 15, 2025 at 3:00 PM Authentication error. Server returned error "[AUTH] Temporarily blacklisted IP Address - try again later"
Sat, Feb 15, 2025 at 2:53 PM Authentication error. Server returned error "[AUTH] Temporarily blacklisted IP Address - try again later"
Sat, Feb 15, 2025 at 2:49 PM One mail fetched.

Sat, Feb 15, 2025 at 2:45 PM No mails fetched.

Thanks for confirming! Have you already checked all of your email settings to ensure that everything is set up correctly with the POP3? Here is a link to how those settings should look, https://www.xfinity.com/support/articles/update-pop3-110-995. 

Not helpful. Having previously searched extensively trying to understand the nature of the problem and fix it, I did previously see the link that you sent. Please check it for yourself and confirm that there is no mention of Google nor gmail among the various other providers: Thunderbird, Windows Live, Mac, Outlook. Surprising in that gmail is probably the biggest of them all. Makes one wonder how old and out-of-date is this Comcast information. 
The standard for Comcast POP3 setup seems thus:
   Enter Username:
   Enter Password:
   Enter POP Server: pop3.comcast.net
   Port: 995
   ✓ Leave a copy of retrieved message on the server.
   ✓ Always use a secure connection (SSL) when retrieving mail.
While these entries are accepted and Comcast email may be retrieved for a while, the Server returned error: "[AUTH] Temporarily blacklisted IP Address - try again later" recurs, definitely slowing the process possibly over days. This authorization failure I suppose to be generated by the Comcast server.
Again there is mention of the problem in this forum going back many years, but no clear instruction of a fix, nor a contact to help.
I do thank you and all forum members everywhere for your participation and thoughts. I'm ever hopeful and not so alone in the face of inevitable tech troubles.

@XfinityMarcus​ since this is affecting many xfinity users and not just one user, can YOU forward this issue to the relevant Comcast teams so that they can solve it? It's not something we can fix on our end as the customer. 

Hello user_46z771, thank you for reaching out and sharing your thoughts on this situation. We have had several threads discussing this, and some have confirmed solutions. 

Starting on November 21, Gmailify is not able to connect to my Comcast account to retrieve my messages to Gmail