Blacklist error message 0X800CC92

@XfinityAmandaB​ Hi Amanda,

Good to see that, but it seems that IMAP shows up in funny ways when I try to access my Comcast/Xfinity email. When I looked into setting up an Xfinity Email Address at Comcast, I don't see the POP3 option. Maybe I missed it. I thought about removing my existing Comcast accounts in Outlook, NOT in Comcast, but I'm not sure what gets saved or how to save past important emails. This might be more difficult if I use IMAP in a new account, since I've been manually discarding emails on the Xfinity site after having read them there because the downloads failed. To add to the confusion, both my wife and I were able to download emails using Outlook yesterday, but NOT today.

In addition to the popup that asks for password verification but ignores whatever choices I make, I've just started to receive a popup which emerges the first time I try to download in a session. This popup states INTERNET SECURITY WARNING and asks if I want to continue to use this server. It includes the message that the target principal name is incorrect. The certificate points to imap.email.comcast.net, which doesn't seem like what I'd want to use for a POP3 connection. It was from COMODO CA, which apparently is doing business as Sectigo. Totally beyond my ken.

This apparent focus on IMAP is why I asked if Classic Outlook was still supported. I didn't ask about whether POP3 is still supported because my wife has the same problems with the Outlook - Comcast connection even though she's using IMAP exclusively. And, even though my POP3 connections to Comcast fail most of the time, the fact that they work without problems intermittently makes setup issues not very likely.

@XfinityAmandaB​ Hi Amanda,

I have used Classic Outlook on my desktop running Windows 10 for at least a year and a half. It came to me through Windows 365 to which I have a live subscription. Until a month or two ago, everything worked fine. So, I can't see where or how an intermittent connection problem which has become dominant, could arise from a password field not being filled out. Of course, my not seeing how this could occur doesn't mean there isn't some way where a password field is missing, but I doubt it.

Yesterday, both my wife's and my email access to Comcast through Outlook worked every time. Today, we're back to being rejected. I get the wrong server message followed by the Blacklist message that pops for each POP3 account. My wife, using only IMAP connections, only gets the Blacklist message. Our routers are from eero via our ISP, and they haven't seen anything like this.