a) the first time I used the auto configuration option, but it didn't work
         b) the second time I used the manual configuration and changed my username from username@yahoo.com to just username

Access to my yahoo mail account has always been a bit spotty but recently it's flat out refused to work. I was getting the message "login to server imap.mail.yahoo.com failed". What I've tried so far: 1) The username had been listed as username@yahoo.com--I tried changing this to just my username to no avail. 2) I deleted my account in Thunderbird and tried recreating it. a) the first time I used the auto configuration option, but it didn't work b) the second time I used the manual configuration and changed my username from username@yahoo.com to just username In both cases I got the error message "Configuration could not be verified-is the username or password wrong?" I use 1Password to store all my passwords, so I'm cutting and pasting it right into the dialog box so I know it's right (I also tried typing it in just in case the cut and paste somehow corrupted it). 3) Just for the heck of it, I went into my router and disabled the firewall there, but to no avail. 4) When I ping imap.mail.yahoo.com from the command line there are no problems/dropped packets. I'm running Windows 10 (with auto-update so it should be the current patch release) and I just upgraded Thunderbird to 45.1.0. I've searched these forums and googled the problem (which is where I learned about the username vs username@yahoo.com issue). Any help would be greatly appreciated! Thanks in advance!