My inference is that this is a new setup on the PC that has yet to work the first time. And Spectrum is your email provider, yet Spectrum doesn't know the proper server for you? I don't know Spectrum, but if you post complete text of error message and screenshots of your incoming and outgoing server settings panes, someone here may have suggestions. thank you

Thanks David for the reply. This is not a new PC. Been running Thunderbird (Beta) for years. I have found that the last update check worked on 1-6-26 but still can't pin down what happened to make Thunderbird stop connecting for updates. Whatever stopped the updates is also stopping the send/receive. All send/receive settings have not changed so I am now zeroing in on spectrum doing blocking, NoScript & Ublock and SandboxiePlus and OpenDNS.

If you have any ideas please let me know. Thanks.

Puzzling. If the laptop and PC are set up identically, they both should either work or both should fail. I suggest a careful review of settings on the two machines.

I talked to customer service at Spectrum and they verified there was never a block put on my account because of the high number of try's to log in. They say everything is working on their end.

The had me log in with my laptop which works with the email. They came back and said to check my PC login settings for the email pop-server connections.

Turns out the connection security setting and the authentication method had changed. Now email works fine both ways. I had changed these settings many times while testing and nothing worked. Here's the kicker, Thunderbird update now works also as it would not work all the time email was down.

Thanks for your help.

Thanks for the feedback. You will be doing us a favor if you post the updated server connection security and authentication methods, as this is a common issue. Thank you

Solved problem of not receiving/sending of E-Mails. It was incorrect email server protocal.

CORRECT SETUP IS FOR SPECTRUM IN LOS ANGELES,CA using pop-server: SMTP Server is "mail.twc.com" Port is "587" Connection Security is "None" Authentication method is "password transmitted insecurely" Server Name is "pop-server.ca.rr.com" Port is "110" User Name is "each email address's account email" Use the same "None" & "Insecure password" for each account Hope this helps someone.

Most Spectrum users apply secure settings:

incoming server: mail.twc.com, 995 (POP) or 993 (IMAP), SSL/TLS, normal password, email address

outgoing server: mail.twc.com, 587, STARTTLS, normal password, email address

https://www.spectrum.net/support/internet/mobile-email-setup

I have almost the same problem. My household has used Roadrunner (now Spectrum) email for years. Today a family member who accesses his account through Spectrum webmail, was informed he had to change his password, which he did successfully.

I have four Roadrunner email accounts that I access via Thunderbird. Concerned that the email would stop working due to new password requirements, I chose the account I use least, logged onto Spectrum and was required to change the password. I did so, successfully accessed the email, then logged off. I opened Thunderbird and got the expected popup box for the account in question, asking for a new password. I entered it, but it still wouldn’t connect. I then went into the well-hidden Thunderbird settings and changed the saved password, but that account still wouldn’t connect.

I have so far • checked and rechecked the saved password to be sure it’s correct • gone back online and successfully accessed the webmail using the new password • restarted my computer (Windows 10 PC) • gone into the specific email account’s server settings to be sure they match Spectrum’s online info, which I checked directly and also via sfhowes above entry; this is an IMAP account and everything in the settings matches exactly • I even tried the bizarre “no security” settings that worked for Mike9259, which fortunately didn’t work either

The bottom line is that all I’ve done is change the password, and now Thunderbird and Spectrum won’t connect with each other. Thanks in advance for any helpful suggestions.

I have never used IMAP so not sure how it works so can't help you there. While getting my email to work I did find that in Firefox setting under security, passwords that several user names and passwords were not the new ones I changed to. Make sure the Firefox setting and the Thunderbird server settings match. Hope this helps.

Thank you for your reply. I don't save passwords in Firefox, but that tip could be helpful to someone else.

In the meantime, a day later, opening Thunderbird initially resulted in pop-up boxes asking for passwords for all my Roadrunner accounts. At first when I entered them and checked the box to use my stored passwords, I kept getting messages saying that one or more of the accounts couldn't connect. But strangely I noticed they were still getting email, and I tested this by sending from one box to another. Even the account I'd changed the password for was able to send and receive, something I hadn't thought to check in the face of Thunderbird's "failure" message.

After opening and closing Thunderbird a few times and dealing with the pop-up boxes, only one box came up, the one for the account that Spectrum considers "primary," i.e. the administrator account. Again I entered the password (that has NOT been changed) and since then, I can open Thunderbird without anything popping up, and all the accounts are passing my send/receive tests.

I now have hope of updating the passwords for all the accounts without permanently losing communication with Thunderbird.