Last night my Thunderbird email stopped working with the Yahoo! IMAP servers.
The SMTP Server appears to be working, but sent messages don't save to the "Sent" folder after they've been sent.
Incoming emails aren't being retrieved, but I get them...
Didn't see the "fix" proposed here until this morning. My Thunderbird is working fine now without it, so someone at Rogers finally fixed the actual problem. Seems they don't like to admit there was anything wrong though.