can't send mail on new personal Outlook.com account
Can get(POP3), but can not send emails to a newly created personal outlook.com account.
the following error occurs when trying to send mail: Unable to authenticate to Outgoing server (SMTP) . Please check the password and verify the 'Authentication method' in 'Account Settings | Outgoing server (SMTP)
all my setting are correct per thunderbird and microsoft:
(smtp-mail.outlook.com, port 587, STARTTLS, OAUTH2, xxxxx@outlook.com)
thunderbird error log file contains the following: . . . mailnews.smtp: S: 535 5.7.139 Authentication unsuccessful, SmtpClientAuthentication is disabled for the Mailbox. Visit https://aka.ms/smtp_auth_disabled for more information. [CH5P220CA0005.NAMP220.PROD.OUTLOOK.COM 2026-02-28T23:29:21.878Z 08DE7703D4D1982A]
SmtpClient.sys.mjs:452:17 mailnews.smtp: Command failed: 535 Authentication unsuccessful, SmtpClientAuthentication is disabled for the Mailbox. Visit https://aka.ms/smtp_auth_disabled for more information. [CH5P220CA0005.NAMP220.PROD.OUTLOOK.COM 2026-02-28T23:29:21.878Z 08DE7703D4D1982A]; currentAction=_actionAUTH_XOAUTH2 SmtpClient.sys.mjs:578:19 mailnews.smtp: Error during AUTH XOAUTH2, sending empty response . . .
Based on my understanding its seems thunderbird is using SMTP AUTH instead of OAUTH2 as required for newer personal outlook.com accounts. Is my assessment correct? If so, is there a fix?
All Replies (5)
tried smtp.office365.com and a few others many times. It doesn't work. it errors out the same.
Based on the error log info it seems the wrong AUTH type is being used. Can anyone confirm thunderbird is using the proper authorization method based on the error log data provided?
tbirdUser_t3 said
tried smtp.office365.com and a few others many times. It doesn't work. it errors out the same. Based on the error log info it seems the wrong AUTH type is being used. Can anyone confirm thunderbird is using the proper authorization method based on the error log data provided?
Did you try Normal Password ?
tbirdUser_t3 said
yes, tried normal password and also encrypted password.
This works for someone. Two things to try:
1. Go to TB menu > Settings > Privacy & Security > Passwords > click the 'Saved Passwords' button and remove the Office entries > try to log in again
2. If fail, delete the account and recreate the account this way:
- go to TB menu > Settings > General > Account hub > uncheck 'Create accounts in the new Account Hub'
- go to TB menu > New Account > Email
You must log in to your account to reply to posts. Please start a new question, if you do not have an account yet.