This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search 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.

Learn More

Outlook configuration fails when setting up SMTP/Outgoing Server

  • Akukho zimpendulo
  • 0 zinale nkinga
more options

Attempts at configuring Outlook account via Thunderbird for Android always result in an "Authentication Error" when setting up the outgoing server.

Using default settings:

Server: smtp.office365.com Security: StartTLS Port: 587 Authentication: OAuth 2.0 Username: xxxx@outlook.com Client Cert: None

Detailed message says authentication unsuccessful, but I don't get any errors when I login for the Incoming/IMAP server connection.

Attempts at configuring Outlook account via Thunderbird for Android always result in an "Authentication Error" when setting up the outgoing server. Using default settings: Server: smtp.office365.com Security: StartTLS Port: 587 Authentication: OAuth 2.0 Username: xxxx@outlook.com Client Cert: None Detailed message says authentication unsuccessful, but I don't get any errors when I login for the Incoming/IMAP server connection.

You must log in to your account to reply to posts. Please start a new question, if you do not have an account yet.