![]() Mailnews.smtp: Authentication failed: Unrecognized command 'unknown' SmtpClient.jsm:742:19 Mailnews.smtp: Authentication failed: Unrecognized command 'unknown' SmtpClient.jsm:701:17 Mailnews.smtp: Command failed: 500 Unrecognized command 'unknown' currentAction=_actionAUTHComplete SmtpClient.jsm:515:19 Mailnews.smtp: Error during AUTH XOAUTH2, sending empty response SmtpClient.jsm:1038:19 Mailnews.smtp: Command failed: 535 Authentication unsuccessful currentAction=_actionAUTH_XOAUTH2 SmtpClient.jsm:515:19 If you have this box unchecked already, and still can't send, an error from the error console in Tools -> Developer Tools -> Error Console would be very helpful. It is not applicable for M365 personal account. Note: It may take a few minutes for the SMTP server to reflect the change. Please make sure it's actually enabled at by unchecking the box shown in this screenshot at Settings -> Mail Flow. Microsoft disabled SMTP auth by default some time ago. (In reply to Andrei Hajdukewycz from comment #10) As same as bug 1775077, login failed dialog appears, but neither "Retry" nor "Enter New Password" works, endless loop. SMTP:, STARTTLS (587), OAuth2 Tb 102.7.1 圆4 + brand new profile Copy from bug 1799259 comment 8 (my post)Įnvironment: Win 10 22H2 圆4, M365 personal account
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