Thunderbird office 365 login failed here is a link to the required settings in Thunderbird. " I create an office365 web mail account in thunderbird and all the mail is receiving and sending but in slow; Cannot send mail via office365 smtp server; Thunderbird and Hotmail; Microsoft OAuth Authentication and Thunderbird in 2024; Manual Account Configuration Jan 24, 2024 · I also had to update the imap and smtp server names. com, hotmail. com. Jul 12, 2020 · Office 365 account IMAP "Login to server outlook. Make sure that they are correct. com" for pop and imap, and "smtp. office365. com failed. May 14, 2024 · Reasons for the Thunderbird not Working with Office 365 Issue. com, Microsoft 365 (formerly known as Office 365 and often abbreviated as O365) or other Microsoft-hosted email services, you may see the following issues: Jul 27, 2022 · Hi, I've been using Office 365 on Thunderbird (POP) for 1 year without problems. Yesterday out of the blue when I opened Thunderbird , It kept saying Logon failure: unknown user name or bad password. Dec 31, 2024 · in Thunderbird go to Account settings and at the bottom of the settings page open Outgoing Server (SMTP) highlight and then click 'edit' the Outlook entry which will open the server settings. change the port settings to 587 then click 'OK' to save. Dec 9, 2024 · I have tried every conceivable combination of server setting. Thunderbird returns: "Login to server smtp. . " Followed by "Sending of the message failed. And there they were, the correct server names, small and fuzzy: "outlook. May 12, 2025 · As a result, we have been forced to make configuration changes to Thunderbird, which may have side effects for users. com" for the send server. com with username xxxxx@xxxxx**** failed. Unable to authenticate to Outgoing server (SMTP) smtp. Changes or problems you may encounter. The Microsoft support page shows Thunderbird dialogs in order to highlight the authentication method. Listed below are some reasons behind the Thunderbird from working with Office 365 issue: Sometimes, Thunderbird may fail to connect to Office 365 if the configuration settings such as server addresses, ports, and encryption protocols are incorrect. For outlook. viqub rpghg lcprsp klclcb nhifoirv zimxoe lwh ozk dotzt ioxhw