I've had trouble with my att/yahoo email account across all platforms, but was able to get back on board by resetting my password to the same as before. The only holdout is Thunderbird which would receive mail but not send. I tried deleting the mail account and adding it back, but the POP server is the only option. I did a manual configuration for IMAP and it was a no-go. I uninstalled Thunderbird and re-installed. What else can I do? Windows 11 Pro.