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I can receive, but not send, emails from my fresh installation of Thunderbird on fresh installation of Trixie Raspberry Pi OS

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john818
john818
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I have a new Raspberry Pi 4; OS is version Trixie (released in Oct 2025) and I installed Thunderbird apparently successfully a couple of days ago. I had asked our admin for a new email address (just for this Raspberry Pi device) and I added it to Thunderbird apparently successfully. It successfully receives all emails.

However, sending fails with the message "login to server smtp.office365.com with username ################ failed" (the message had the correct user name)

I have retyped the password many times. No success. I have edited the SMTP server settings selecting all the Authentication Methods in turn ( no authentication; normal password; Encrypted password, Kerberos / GSSAPI, NTLM and OAuth2 which was the one Thunderbird had placed there and which google told me was the right one.)

I even tried to use smtp-mail.outlook.com as my SMTP server (Microsoft suggested this), but all to no avail. Don't think I am an expert just because I tried various things. I was getting desperate. I was supposed to deliver the device yesterday. Please help. Thanks in advance.

I have a new Raspberry Pi 4; OS is version Trixie (released in Oct 2025) and I installed Thunderbird apparently successfully a couple of days ago. I had asked our admin for a new email address (just for this Raspberry Pi device) and I added it to Thunderbird apparently successfully. It successfully receives all emails. However, sending fails with the message "login to server smtp.office365.com with username ################ failed" (the message had the correct user name) I have retyped the password many times. No success. I have edited the SMTP server settings selecting all the Authentication Methods in turn ( no authentication; normal password; Encrypted password, Kerberos / GSSAPI, NTLM and OAuth2 which was the one Thunderbird had placed there and which google told me was the right one.) I even tried to use smtp-mail.outlook.com as my SMTP server (Microsoft suggested this), but all to no avail. Don't think I am an expert just because I tried various things. I was getting desperate. I was supposed to deliver the device yesterday. Please help. Thanks in advance.

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john818
john818 Nkolo motuna
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Since I posted this problem maybe 15 minutes ago I have reviewed previous answers on this forum. One suggested I delete all my saved passwords and I would be asked for my password next time I sent a message. I deleted my saved password and tried to send again. Thunderbird asked for my password, I gave it the one I had used when setting up the account and again it failed. Just like before.

I have heard such good things about Thunderbird, too.

Tuna motuna

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