Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

Avatar for Username

Søg i Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Læs mere

The login attempt to the server smtp.office365.com with the username XXXX has failed.

  • 3 svar
  • 0 har dette problem
  • 75 visninger
  • Seneste svar af david

dreyes2398
dreyes2398

Hello:

I use Thunderbird for work. I have several email accounts configured in it, including Gmail, my company's email, and Outlook. I recently added a new Outlook account, and I haven't been able to send a single message. The error I'm receiving is the one described in the title. It's worth noting that I have another Outlook account working perfectly. I've tried every solution I've found online, and none of them have worked, including enabling SMTP in the account settings, making sure OAUTH is enabled, using smtp.outlook.com or smtp.office365.com instead of smtp.mail.outlook.com, enabling two-factor authentication, changing my password multiple times, etc.

Hello: I use Thunderbird for work. I have several email accounts configured in it, including Gmail, my company's email, and Outlook. I recently added a new Outlook account, and I haven't been able to send a single message. The error I'm receiving is the one described in the title. It's worth noting that I have another Outlook account working perfectly. I've tried every solution I've found online, and none of them have worked, including enabling SMTP in the account settings, making sure OAUTH is enabled, using smtp.outlook.com or smtp.office365.com instead of smtp.mail.outlook.com, enabling two-factor authentication, changing my password multiple times, etc.
Vedhæftede skærmbilleder

Alle svar (3)

david
david
  • Top 10 Contributor

Try this: - click 'account settings' - highlight account in left side bar - now, in lower right, click the 'edit SMTP server' button - does the next screen show the email address of this new account? Or does it show the email address of a different account?

If i shows a different email address, you're using the wrong SMTP server. back up to prior screen, click the dropdown menu for 'Outgoing SMTP server' and select the one for your account.

dreyes2398
dreyes2398 Spørgsmålsstiller

Hi David, thank you for your response. I see the same email as the account, so I assume that's fine. I attached a photo so maybe you can identify an error.

david
david
  • Top 10 Contributor

I cannot speak for MS. My personal Outlook account, which works fine, uses smtp.office365.com

Stil et spørgsmål

Du skal logge ind på din konto for at svare på et indlæg. Start et nyt spørgsmål, hvis du ikke har en konto endnu.