I've been seeing similar symptoms as you. I believe Comcast's email system is not working right today. It's been up and down since last night - mostly down, though it seems to be up for me at the moment. Webmail appears to be working correctly.

Bluemail on my phone is also having difficulty. Usually it says, "cannot connect to server", but if I try again right away sometimes it will connect, but it doesn't always retrieve mail that I know is there.

I don't think there's anything we users can do except sit tight until they fix it.

I am having an issue with retrieving my email in Thunderbird. On laptop, using Version 140.2.0esr | Released August 19, 2025. No changes were made to Thunderbird settings. The email is showing up in the Comcast portal, but for now having it forwared to a Gmail account. Tried changing password in Comcast (and in Thuderbird) to no effect. Tried deleting my Comcast email account in Thunderbird and re-adding it, but no change. Can send out email fine, just receiving it is the issue. Interestingly, I use BlueMail on my phone and it, too, has the same issue and will not retrieve from Comcast. Thanks in advance!

Hey, had the same problem recently, turns out Comcast started requiring an app password if you have 2FA turned on. Go to your Comcast/Xfinity account settings, generate an app password, and use that in Thunderbird and BlueMail instead of your regular password. That fixed it for me. Worth a shot!