Login failed. authentication failed to server imap.mail.yahoo.com
Continuation of my prior post: https://support.mozilla.org/en-US/questions/1516342
Thunderbird has a routine problem with being unable to log into various mail servers. I have four accounts and they all seem to share this problem.
Most recent update: I've tested this in Windows Safe Mode, and the problem has not appeared. Since I can't do any useful work in Safe Mode, it's hard to give it a thorough test, but so far so good. Also, I have removed AVG antivirus because it was redundant. I have seen no improvement since it was removed.
Can this problem be resolved?
All Replies (7)
I have removed AVG antivirus because it was redundant.
So what AV software are you using now?
Try to start Windows 10 in safe mode with networking enabled.
Does the problem go away?
Windows safe mode disables anti-virus software. This is a troubleshooting step, not a solution.
You should know the drill by now: https://support.mozilla.org/en-US/questions/1516342#answer-1743699
Christ1,
It looks like you were right, it was the anti-virus software. Since this is the first Windows computer I've built since Windows 7, I didn't realize until recently that Windows installs its own anti-virus software, hence the use of AVG, which was never the problem. Once this came to my attention, adding the needed exception to Defender solved the problem.
Thanks for your help with this problem.
Modified by raypackard
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