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I cannot send from an Office365 account but can get mail - it simply says 'sending' but nothing happens.

I am using Owl (paid subscription) for my Office365 account.

I also have another email that is a simple IMAP account and that works beautifully!

For some time now my primary email address gets wiped clean every night and is empty every morning. I have to transfer received mail to another input address to keep it safe!

I send out golf group e-mails. I have myself (e-mail address) in the group, so it will also come back to me. The server keeps rejecting my group e-mails because it says my e-mail address is incorrect, I have checked it several times and it is correct. I even edited it to be sure. Why is the server still rejecting it?

Thanks for your time....Paul Smart psmart@triad.rr.com

I can receive mail fine. Cannot send mail on gmx.co.uk acct, but gmx.net works on oauth2. But oauth2 is missing on gmx.co.uk It's just not on the pulldown. I tried a new thunderbird acct for gmx.co.uk but oauth2 is still missing.

I get this error ALL THE TIME from TB. Sending of the message failed. The message could not be sent because connecting to Outgoing server (SMTP) smtp-mail.outlook.com failed. The server may be unavailable or is refusing SMTP connections. Please verify that your Outgoing server (SMTP) settings are correct and try again. Copilot says that TB is NOT recognizing my personal Outlook email account as a viable SMTP account. Been on line with Copilot for couple of hours without success. Does anyone at Mozilla have anything to offer me?

Hello, so I have Thunderbird installed on 2 Windows 11 PC's both are updated and operating with all updates! On my 1st (main) PC which I use 98% of the time Thunderbird has been running perfectly with IMAP and Oath2.

Last night on the 2nd PC I rarely use I opened Thunderbird and it started to download messages for awhile and all my 2026 up until OCT 2025 disappeared?

I logged into Yahoo Mail from a browser and yup all gone?

I sent a deleted by accident request to YAHOO and today all my mail had returned when I checked on my 1st (main) PC.

I started the 2nd PC and all was good, till it started downloaded messages again? And POOF right back to square one?

What's happening? Should I confirm that IMAP and OATH2 are enabled on that PC before I do something else? I've sent another DELETED request to Yahoo and at this point I'm thinking to just REMOVE Thunderbird all together on the 2nd PC.

For some reason, Thunderbird is prematurely word wrapping (or inserting line breaks) on emails that are sent.

I'm using default 'HTML Style' Defaults, but have also messed around with those to see if I can fix the issue - to no avail.

I found an old 'question' on the support site where this seemed to have been resolved (https://support.mozilla.org/en-US/questions/1307490). Unfortunately, the Solution doesn't appear to apply to modern Thunderbird versions (e.g., version 148); I can't find the suggested setting to change.

Mam problem, pierwsze parę kont dodanych do Thunderbird działa poprawnie i nie ma z nimi problemu. Natomiast pojawił się problem z kolejymi pocztami -nie widzę na nich połowy folderów, albo w sumie żadnych, ani wiadomości wysłanych, ani roboczych. Znowu na innej poczcie w odebranych, nie widzę nadawców - tylko własnego maila. Próbowałam na nowo zainstalować te poczty, jednak nie przynosi to zamierzonych efektów, albo wręcz jest jeszcze gorzej.

I am unable to send emails (but can receive). When I try to send an email with an attachment, I get the pop up that states "Login to server smtp.(companyemail).com with username icclabcalibrations@(companyemail).com failed". Once I hit "retry" twice, another message pops up that says "Sending of the message failed. The message could not be sent because the connection to Outgoing server (SMTP) smtp.(companyemail).com timed out. Try again." Once I try again, a third message pops up saying "Sending of the message failed. An error occurred while sending mail. The mail server responded: ...authentication rejected. Please verify that your email address is correct". I have made sure to check that the connection security settings are correct as well as the outgoing server settings. I have also edited my email and replaced it with "(companyemail)" for privacy reasons.

My company uses your email software and everyones email is not working. For example, my email (madison.l@valleyhha.com) does not allow me to send messages without an error popping up (Your message was sent but a copy was not placed in your sent folder (Sent) due to network or file access errors. You can retry or save the message locally to Local Folders/Sent-madison.l@valleyhha.com.)

This goes for my entire staff of 20 people. Same error, also all my unread messaged in my inbox have now disappeared. Not only that but we are also not receiving any new emails either

Hi!

I can't get messages from my Thunderbird account. When I click "Get messages" nothing happens and it usually says "Done" on the bottom left corner. I have to use my domain's webmail account to get my e-mail and it only allows me to read it and delete junk.

I really would love to have my Thunderbird account working again as soon as possible.

Thanks so much, Nancy Pedersen

I subscribe to a number of RSS feeds in TB. This works well nearly all of the time but sometimes I find that TB has paused updates. I never want it to do this.

Why does it happen and is there a way to stop it doing it?