Thunderbird Community Forum

I just got a new Windows 11 computer. After installing Thunderbird 147.0.2 I noticed there were no columns at the top of the message pane as there had been in the past. I read articles about how to add the columns but could not find the column icon or anything in the header area that allowed me to do what the articles recommended.

I want to add the columns for sorting purposes from time to time but I can't find a way to do it. HELP!!! Please?

Thanks, Clyde

Hello, can someone please fix this e-mail address please & thank you.

Following the instructions provided at this web page: https://developer.mozilla.org/en-US/docs/MDN/Community/Community_Participation_Guidelines I e-mailed a code of conduct violation report to the provided email address, mdn-cpg-report@mozilla.com

Actual results:

I immediately received the following e-mail reply, telling me in effect that my e-mail could not be delivered:

Subject: Delivery Status Notification (Failure) Date: Sun, 15 Feb 2026 21:34:30 -0800 (PST) From: Mail Delivery Subsystem <mailer-daemon@googlemail.com> To: [redacted]

Hello [redacted],

We're writing to let you know that the group you tried to contact (mdn-cpg-report) may not exist, or you may not have permission to post messages to the group. A few more details on why you weren't able to post:

You might have spelled or formatted the group name incorrectly. The owner of the group may have removed this group. You may need to join the group before receiving permission to post. This group may not be open to posting. If you have questions related to this or any other Google Group, visit the Help Center at https://support.google.com/a/mozilla.com/bin/topic.py?topic=25838.

Thanks,

mozilla.com admins

[headers, etc redacted]

Expected results:

I expected instead to receive a reply telling me that my e-mail had been successfully received.

After an email update this morning, I went in to look at an old email and nothing was there. Checked all my other folders and they were all empty. How and/or can I get them back. Some were ones that I did not need to loose.

How do I import *.ICS file in a reasonable amount of time. I have appointments in an ics file of less than 1 K in size, typically 700 - 800 bytes in size and they take HOURS to import and do not connect properly then to allow editing the appointment. This is from Baylor Scott and White, a major hospital system in Texas. If there is a problem with the imported file structure, please point me to the correct file structure. I like Thunderbird, but this part of the calendar is very frustrating. Clarence

Hi all,

I am new to a Mac (1 year now) and am trying to make Thunderbird work for me as I have not been happy with other mail clients. I am struggling through a few things.

I like to navigate by keyboard if possible. In the Calendar tab using a month or multi week view, the "[" and "]" move month by month or week by week in multi-week view. How do I move to the next day or two using the keyboard?

A big thank you to all who reply, and sorry if this question has been answered many times before (I did not find the answer in the keyboard FAQ). --Tim

None of the topics suggested fit. I'm having trouble with getting extensions on toolbars. In the customize toolbars window there's a toolbar at the very top of the page that starts with mail, calendar, addressbook, etc. Just for example, the Google Calendar and Outlook Calendar extensions are in that toolbar, but I can't move them to another toolbar and that toolbar disappears when I close the Customize page (either way) and I haven't been able to find a way to get it displayed in other places. That toolbar is very similar to the toolbar that appears on the left side of the Thunderbird window, but that one doesn't include the extra extension buttons that I mentioned above.

Some people in various places have suggested that customizing Thunderbird toolbars is done the same way as in Firefox. But I haven't been able to find a puzzle piece icon anywhere.

By the way, I used to be able to add more toolbars, which I found to be an attractive concept, although that implementation didn't always work so well.

A satisfied user of TB on Linux for many years, about 3 months ago I lost many recent messages when transferring from an ancient laptop running Ubuntu to a new laptop running Fedora 42.

I installed my entire file system, including the .thunderbird directory in the home folder, on the new machine from a Duplicity backup of the old machine (BTW, I've now switched to Restic). All my files seemed to be just fine, except that when I opened TB, most messages in local folders that had been received earlier in 2025 were missing.

Hoping the problem was a defective backup, I made a new backup of .thunderbird on the old machine and copied it to the new machine. Nothing changed.

Thinking that Duplicity might be failing to backup TB files correctly, I then decided to copy .thunderbird itself (i.e., the directory and subdirectory structure and all files therein themselves) directly to a USB stick and attempt to restore from that. Unfortunately, the old machine then failed to boot up. Since then I've been making with a big gap in recent email history.

With a bit of spare time over the holidays, I've finally managed to boot up the old machine. TB running there shows the messages missing from the new machine. I have copied .thunderbird to a stick, as I had wanted in September. The problem now is that I cannot simply copy my old TB profile to the new machine, because I'll lose the last 3 months of locally stored email traffic.

So, how do I get the lost messages onto my new machine without losing recent messages or creating loads of duplicates?

My old calendar kept events in Reminder mode until I dismissed them. Thunderbird dismisses them too soon. Can I force it to keep displaing the reminders?

I did something one time, but it suddenly showed a whole month of reminders! That was too much. I just want to be the one who decides to dismiss. Thanks.

I would kindly ask for adding support for PGP/inline for Thunderbird on desktop. I am aware that there is a valid argument against PGP/inline and a workaround for using it regardless [1]. However, there are also some use cases, which apparently led to it being implemented for Android [2]. My use case are PGP/inline signatures for (unencrypted) newsgroup posts. In this context, the advantages of MIME are less pronounced and some disadvantages show. PGP is less supported by newsreaders, which in the worst case leads to illegible messages in the case of MIME. In some groups, multipart messages are prohibited by the charter. Similarly, for discussion based groups, attachments are seldom (or prohibited) and messages often monolithic, thus ensuring integrity even with PGP/inline. Also, privacy (unencrypted metadata) is not really a concern on a public message board. While PGP/MIME is a good default, newsgroups are an example where it would be desirable to have an option to switch to PGP/inline on a message-by-message basis or even as an account default. There are already PGP specific options in both, the account settings and the message settings. Extending that by another checkbox seems like a good solution to me.

[1] https://support.mozilla.org/en-US/questions/1446050 [2] https://github.com/thunderbird/thunderbird-android/issues/1974

When I send a message, it actually is sent, however the windows showing send progress continues on for some time, after which I need to click on cancel to close this window. At first I did not think the mail was being sent, however after replies on them were being received, and when sending an email from one of my email addresses to another, I get the windows message that the email was received. Why isn't the process window closing when the message was actually sent??

I’m trying to filter Calendar events by Category and then sort the results by Start Date. Currently, I can use the “Search All Events” feature to display events and sort them by Category, but I’m unable to apply multiple sorting criteria or filter the results to show only a specific Category before sorting by another field.

Is there a way to first filter events by a specific Category and then sort those results by Start Date? What would be the correct approach to achieve this?

I use Linux Cinnamon Mint on two Dell desktops - they are set up identically and perform in the same way with one exception. Both appear to be the same version of Thunderbird and have identical settings but on one computer the appearance of the typeface (in for example a listing of emails) is less clear /sharp than on the other.

When I say they are the same version - they both say 140.7.1esr (64-bit) but after that on one computer it says "Thunderbird for Linux Mint -mint-001 - 1.0". This qualification appears on the computer where the typeface is less clear but not on the other.

I should add that the issue seems to relate solely to Thunderbird - it does not present when looking at (say) websites on Firefox.

Being of a certain age clarity is important and I just wonder if I am missing something? Thanks for any help.

Hi!

I've added some subfolders to my inbox on my laptop but these folders dont appear or sync on my phone, I've checked all settings and they seem to be in order. Can you point me in the right direction to fix this?

Cheers,

Henk

В первой половине дня не отправляются письма в thunderbird, во второй начинает работать. Проблема появилась 3 недели назад, причем по всем филиалам с разных IP адресов. При этом напрямую из браузера письма отправляются. P.S. в thunderbird входящие приходят. В чем может быть проблема? Во вложении скрины

I was sending an email with an attachment I wanted to check the attachment before I sent it. But I chose windows media player and it won't work I went to remove media player but I couldn't open my attachments, so I put the attachments back on but I still can't open my attachment. What do I do so I can Read my attachments again Thank you Richard

I am using Thunderbird 115.18.0 and Windows 7 professional (no snarky comments please).

All has been working fine for years, but in the last few days, strange thing have been happening:

In the pane with all of my email accounts, the ">" icon to the left of the first account has been disappearing. This meant I could not look at any folders, including Inbox, Drafts, Sent etc and handmade folders. Cured by closing and opening Thunderbird.

I now have two Archive folders, one called Archive, the other Archives. Both empty, neither can be deleted.

Periodically, when the ">" is present, selecting it (to "V"), the list of folders SLOWLY appears, one folder at a time.

Periodically, the bottom of the Thunderbird window, shows a 'downloading' message, of hundreds of files. Several GB of data has been downloaded over a couple of days.

Opening the Inbox folder, the pane with subject, correspondents, date etc has changed the sort order.

Sometimes, all of the emails in this pane have had their font underlined.

Nothing on my system has intentionally changed,

Any ideas what has gone wrong, and how to put things right would be appreciated.

Thanks,

I am setting up Thunderbird on a Win10 machine, and am having a lot of trouble adding accounts that I did not have on the two Win11 machines I have set the same accounts up on.

When adding my 2 GMail accounts, after clicking "Allow" on the OAuth popup the button would go grey the window would stay open and not close, and the account would not be added.

Changing the general.useragent.compatMode.firefox option to TRUE allowed me to progress and finally add those accounts.

I am now having the same trouble with my @hotmail.com account. When I add the account, the dark blue OAuth window pops up, but is completely empty, and there is nothing more I can do.

Things I have tried

• Reverting the above config change
• Checking that cookies and JavaScript are enabled
• Checking there is no saved password
• Used both the Account Hub and the default dialog, with the same effect.

Thanks in advance!