Thunderbird Community Forum

I have been using Thunderbird for some time now and i like it. BUT, the setting of a constant font size, fixed/variable width and Body Text/Paragraph is imo irrational, verging on stupid.

All of the above change at random while typing an email. Mindful this is a free email client for which i am thankful, what sadist developer(s) thought not having a simple procedure to set font, font size and format, like any other email client i have used, is not a sensible thing to do.

I am of the understanding that Thunderbird is influenced by the settings the receiver uses or the settings of the senders email. I don't care what settings they have or use. If they don't like the looks of my email, bad luck. All i want to do is type an email as efficiently as possible and send it. I sometimes spend more time changing back the format of the text i type than typing the content.

I have read solutions such as typing the email in notepad and then pasting it into Thunderbird. Really ! OMG

Looking for help on the www, the so called fixes are so old, the instructions are either not relevant or difficult to follow as the current Thunderbird has changed and things are different places and/or named differently. All this smack of Microsoft mentality where i am convinced things are changed for the sake of change or (cynically on my part) to mess with users.

Maybe Thunderbird can have 2 methods of setting up fonts, sizing etc etc. One a simple 'normal' way like other email clients, and the other as it currently is to accommodate what ever idealistic vision they have.

I'm on 141.0 (64-bit). It says I'm on the "Release update channel." Quickfolders isn't working. How do I get to an older version of Thunderbird where Quickfolders will work again?

I receive a substantial number of phishing emails, as I suspect everyone else does. I also run a "honeypot" to collect such scam messages, and I need to be able to view the entire header. In previous versions, that was quite simple. Now, I cannot find the menu item to enable full header view. Please, where is it?

Thunderbird v 141.0 64 bit on Windows 11 Hope you can help. I have my main Thunderbird calendar synced with a Google calendar. When I created the sync, the Thunderbird calendar was populated with all the events in the Google Calendar. When I created a new event in the Google Calendar, it appeared in the Thunderbird calendar. When I deleted a recurring event (that originally created in the Google calendar) from the Thunderbird calendar, it was deleted in the Google calendar. All good! But I have created multiple events in the Thunderbird calendar, but they are not appearing in the Google calendar.

Any thoughts? Thank you so much. Best, Stuart

I found that an update (Thunderbird 104.1 Oesr) was installed today (7/24/25 @ 7:45 am) on my Windows 11 device after which I could no longer connect to my Yahoo/AT&T Mail account. Is this something that anyone else has experienced? Is it possible that issues with Yahoo/AT&T are having today may have something to do with this?

I'm thinking that when I mark emails as junk, they immediately delete, but are all the junk emails suppose to keep coming back, but now only with that yellow junk banner. I was thinking that if I mark it as junk, they get deleted immediately and I don't have to keep going over them, and seeing them, but now with that Thunderbird thinks this is junk banner. But I already marked those as junk many times. Why do they keep coming back like that?

I installed Thunderbird 140 today and I have discovered that I can’t delete some messages, while deleting others are completely unaffected. There’s nothing special about these particular emails, but no matter what I do, it just will not delete.

This is not normal and never happened before the update, so what can I do to solve this problem?

Is there a way to recover deleted emails that cannot be accessed directly from the account itself? Is there any cloud storage of this data that could be retrieved on the Mozilla/Thunderbird side of things?

I set up message filters to run automatically on my inbox as the messages come in. They don't work. I've searched all kinds of solutions, read and tried the solutions posted here, followed the steps...they don't run. What am I missing?

After an apparent system-wide aol failure, I can no longer log in to my Thunderbird account. When I open it, the message pops up: "Login to server imap.aol.com with username Leisterr8@verizon.net failed." And it asks for a new password. I looked up my saved passwords and tried to enter them. But that does not work. I don't see how to enter a new password. I am able to log in to my aol.com account with my password. But that does not seem to be the same as the password for the Thunderbird account.

Starting today email on my desktop is not downloading and I can't send messages. I can still get email on my phone. What can I do to get email working on my desktop? I get the error message " Login to server imap.mail.yahoo.com at jauerbach@cox.net failed. My options are to retry, enter new password, or cancel. I have tried all three and no option works.

When I try to get new messages, I receive the following: Login to server outbound.att.net with username (my email address) failed. It shows three choices: Retry, Enter New Password, Cancel. I have tried entering my password and I get nothing except the above error message again. Before 9:00 a.m., this morning 07/24/2025 I was receving emails just fine. I could no longer receive emails after approx 9:00 a.m. today, July 24, 2025, and gave me the error message. Luckily, I can get emails on my phone. (I do not have Thunderbird on my phone).

My TB upgraded to V141 today and I lost my google calendar and maybe my contacts too. The contacts are there but I don't think that they are syncing anymore. Calendar appointments missing altogether.

Is there any indication on an email that I've already forwarded it? i.e., How can I tell if I already forwarded and email, and to whom? I guess I could look in my sent folder, but that's quite cumbersome. - Thanks

I have an organizational Microsoft Exchange account that I will shortly lose access to so am trying to archive all my email & attachments from it. For this purpose I installed Thunderbird & connected it to the account using exchange sync. I followed every method I could to try to get Thunderbird to download all the mail, such as selecting each folder as download for offline use. The folders appear populated by email messages. Despite this, when I simulate going offline by cutting the computer's wi-fi connection, Thunderbird is unable to actually open any of the "downloaded" mail. Instead, it shows a blank screen and cycles with the "loading" message in the bottom left corner. Only emails I had previously actually opened will load properly when offline.

The Microsoft Exchange account says that the account takes around 9 GB of storage with attachments. The local Thunderbird folder is only a few MB in size. How can I ensure Thunderbird *actually* downloads the mail and all its attachments so they will be available for offline use or equivalently, available when I lose connection to the mail account? Thank you.

Hi, perhaps my problem is not that unusual, but I'm finding it a bit difficult to solve. I have three email accounts on Thunderbird, and all of them have exactly the same specifications. They are all @hotmail.com. They have the same server name (outlook.office365.com), same port number, same connection security, same authentication method (0Auth2) and same Imap default release code. Never had a problem. Then on July 10th just one of them stopped opening and a message window appeared saying that authentication was OK but it wasn't able to connect. The other two continue to open as before. Any idea on how to rectify this, please.