Refer to Yahoo!'s help page for POP access settings and instructions for Yahoo Mail.
IMAPRefer to Yahoo!'s help page for IMAP server settings for Yahoo Mail.
My sign-in attempt was preventedIf you get the Username or password invalid warning and the Sign-in attempt prevented email when you try to connect your Yahoo Mail with Thunderbird, Yahoo has blocked Thunderbird from connecting because it's a "less secure" non-Yahoo app. In Thunderbird below 68.5 you could enable an option to allow apps that use less secure sign-in in your Yahoo Account. See this Yahoo support page for instructions.
Update: please read section 'Important Changes to Authentication Method Notice' below.
In Thunderbird version 68.5 and up you can change the POP server to pop.mail.yahoo.com (port 995).
Important Changes to Authentication Method NoticeIf you currently have a POP or IMAP mail account in Thunderbird and receive an email from Yahoo that says:
"We’ve noticed that you’re using non-Yahoo applications (such as third-party email,calendar, or contact applications) that may use a less secure sign-in method. To protect you and your data, Yahoo will no longer support the current sign-in functionality in your application starting on 20 October 2020. "
Check Thunderbird has cookies enabled.
In versions prior to 78*:
In versions 78* or later:
Update the 'Authentication Method' for the Pop or Imap mail account.
Exit Thunderbird
Wait a few moments for background process to complete
Start Thunderbird
Then there will be a prompt from your Yahoo ISP partner to login. This is done with a OAuth 2.0 key exchange in Thunderbird which will authenticate the Thunderbird client in future logins.
To configure the Thunderbird calendar (Lightning) with your Yahoo! Calendar, follow the instructions at the page Sync Yahoo Calendar with Mozilla Lightning on the Yahoo! support site.
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