I have used Thunderbird as my mail client for many years on both my Windows workstation and my Windows laptop. My ISP is Spectrum. All of a sudden, today, Thunderbird has stopped sending outgoing emails from my workstation. I get a message telling me that Thunderbird can't connect with the server. Outgoing email seems to work fine on the laptop, as well as on Spectrum's own Webmail interface. I think I'm getting all my incoming messages, although it's hard to know that for sure. Both machines are running Windows 11. I haven't changed any configurations. What can I do to get Thunderbird to function correctly on my workstation? Thank you.