they did this and I quote: Logon to Office 365 > Users > Active Users > Click on the user name > Mail tab > Manage Email apps > Ensure Authenticated SMTP is checked. Updates to some client apps have been updated to support these authentication types (Thunderbird for example, though not yet for customers using Office 365 Operated by 21Vianet), so users with up-to-date versions can change their configuration to use OAuth. ![]() This took quite a while to debug, as Thunderbird has no built in options for connecting to Exchange servers, hence you have to set up IMAP and SMTP.īelow is my working configuration at the time of writing. I located some info where the user had same issue just with sending. In 2020, we released OAuth 2.0 support for POP, IMAP, and SMTP AUTH. step-by-step instructions to implement OAuth 2.0 authentication if your in-house application needs to access IMAP and SMTP AUTH protocols in Exchange Online, or work with your vendor to update any apps. Versions later than 77.0b1 support MFA You must have an existing IMAP approval Use settings: mail server SMTP server. We use Office365 From recent time my colleagues using Thunderbird started receive this message: Sending of the message failed. Slide radio button to 'On' for 'SMTP Authentication.' 8. Thunderbird Outgoing server (SMTP) using STARTTLS since it doesn't advertise that feature. (You have to do this step and the following ones for each email address.) 6. ![]() Then click 'Manage' for the email address you want. ![]() For some reason, Office365 domains are not recognised by default by Thunderbird and such the automatic configuration doesn't work. The current settings in my thunderbird for this account are as follows: incoming server (working): IMAP mail server port 993 SSL/TLS OAuth2 Outgoing server (not working) : port 465 SSL/TLS OAuth2 Thanks all in advance Chosen solution First, the O365 smtp connects on port 587 with STARTTLS security. This functionality is built on top of Microsoft Identity platform (v2.0) and supports access to email of Microsoft 365 (formerly Office 365. No need to expand just click on 'Manage All.' 5. Recently I had to use an Office 365 mail account with Mozilla Thunderbird. Please note that Thunderbird version 78.0 is only offered as direct download.
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