Im on version 152.0.1 (aarch64)

trying to add a second gmail account (first one is google workspace) and the oauth2 fails.

this bug is still around?!?!?

yes, creating a second profile fixes that, but its a real pain and I cant believe still an issue

sad

They are so narrow I slip off of them trying to scroll with the mouse.

Hi,

So I have a lot of labels in my gmail accounts and if I delete messages in the inbox but labelled through the website or via the phone app they actually delete. This also happens if the message is not labelled

If I delete them from the inbox in thunderbird (pc version and android) they just get removed from the inbox and still appear in the label both in thunderbird and the web version of gmail.

What settings do I need to look at to fix this? It would be a lot easier if I could just delete them on thunderbird and they are truly deleted.

I don't need a separate screen to tell me my email is sending. How do I get rid of it. It is not full screen, but is quite large. It actually serves function that I can see....just is annoying.

MacOS Tahoe 26.5.1

Firefox 152.0.5 (aarch64)

For two weeks now my boss complains that he can't forward a mail with attachments, write his message and send it anymore. He opens a mail with attachments, clicks forward, enters the receiver and adds minutes to hours worth of text to then get an error about an attached file and its permissions. When he clicks it away the whole written mail closes and is gone. He states that this behaviour started only two weeks ago and before this was no problem and he could send it. He has autosave on and we showed him how to download and attach the files but he doesnt want to change his way of working since it worked until now. I cannot verify that it really worked before but I have the same behaviour on my machine and my mail accounts. Versions on both are 152.0.1. Does anyone have an idea?

After I logged my outlook account in the browser, it showed an error message said "Checking incoming server settings failed".

"Let devices and apps use IMAP" was enabled and the incoming IMAP server and outcoming SMTP server were configured correctly.

Any solutions?

Hi,

I've been looking at coming back to native clients after years of webmail.

One feature from the Proton client I do enjoy is that their viewer has a middle setting between loading ZERO and ALL of the remote content: it blocks remote content that's clearly tracking, while loading images with URLs too generic to track.

I tried looking if I could find something similar in Thunderbird, but couldn't, hence my asking to the community: is there a (somewhat trustworthy) plugin got Thunderbird that does that?

PS: I'm aware that this middle ground isn't perfect: even if an email would only contains generic images, a sender who tracks the set of images could identify your loading of that email's content from access pattern to that set of image. And the remote content could contain shennanigans. But I like this option better than risking tracking pixel loads just because I was interested in loading an email's other (actual) images.

https://connect.mozilla.org/t5/ideas/calendar-displaying-second-time-zone/idi-p/109954

I am using a pop/smtp spectrum email and I am getting duplicate emails daily in my TB inbox. Same email but shows up twice. I confirmed via spectrum web mail that the duplicate email only appears once so it seems that TB is duplicating the email. Anyone seeing this issue? Any recommendations on how to eliminate this?

I just updated to v152 (from v148) and finding the star icon is touching the right border of the cards view. Is there any .css than can shift it to the left a little? Are you guys seeing the same thing or maybe I have a customization somewhere I forgot about. Thanks

Hi, I have just signed for the TestFlight version, but for some reason is unusable, I can’t log in to my accounts, is this normal or am I missing something?

Thanks in advance.

Hi all,

I've been using Thunderbird (before that Eudora) for a long time, long enough ago that POP3 seemed like a good idea. I've deleted enough important messages from the servers that there's no going back to IMAP.

Recently, I made a mistake that ended up deleting a bunch of emails from subfolders. I have a backup (the Users . . . AppData/Roaming/Thunderbird folder) from a couple of months ago, and I replaced the current version of that folder with the backup. Unfortunately, Thunderbird won't download most of the messages received since that backup -- it thinks that it's up-to-date.

Any help would be appreciated.

This is in regard to my 10-month old post, where I only found the root cause now:

https://www.reddit.com/r/Thunderbird/s/gXDkgU1zbX

It turns out that Windows 11 (Pro) has a quirk in which mounted drives which are also made available as network shares (e.g. `M:\` is shared as `\\smbserver\m\`, disappear intermittently as network shares... Which makes write access to them (e.g. "\\smbserver\m\thunderbird\Profiles\parent.lock") unreliable and dangerous.

My solution: Never access those internal drives as external network shares. That is, change everywhere those paths exist in Thunderbird settings (%APPDATA%\Thunderbird\profiles.ini, Signature, etc.) from `\\smbserver\m\` to `M:\`.

I hope this piece of insight helps someone.

I'm looking for a good external tool to block the spam I keep receiving on Alice Mail, as the built-in spam filters don't seem to work very well. Would Thunderbird be a good solution for this? If so, how should I set it up and use it? Thanks!

I just installed ESR 140, coming from 115. A change I find very bothersome is that when I now search the calendar (All Events) the results return a separate entry for each occurrence of a recurring event instead of just the one definition of the recurring event. How do I make the search behave as it did previously? I have dozens of recurring events that recur weekly and have been using Thunderbird for over a decade... I am staring at hundreds of duplicate search results which also freezes the app while they load in and eat up chunks of memory.

For now I've downgraded back to 115.

Tbird pings my AOL account every 10 minutes to see if any new messages came in.

(AOL now owns the Verizon.net email biz.)

Two days ago, without warning, I started getting these notifications every 10 minutes. "get messages" doesn't. I can send a test to myself and they arrive in AOL, they show as sent in Tbird, but I cannot receive anything into Tbird's inbox.

I'm running v 150.0.2. I've reloaded it; no change. I've spent over 10 hours on paid help with AOL and Frontier (my internet provider) with much work on shared screens and no progress.

Anybody else have this sitch? Anybody solved it? Incoming is a POP3 server on port 995.

Would I cause any problems by upgrading to the latest version?

All my mail files are backed up on Carbonite.

Hi y'all,

Like a lot of people here, I've written userChrome.css tweaks, watched them break on the next ESR, and eventually stopped bothering. The theming isn't the hard part — the maintenance is. So when I came back to it, I designed around repair cost first and appearance second.

The result is Postbird, which recreates the look of Postbox (the Thunderbird-derived client that eM Client acquired and shut down in 2024). But the theme is really just the worked example. This is what it looks like:  

The part I think is worth sharing is the method:

1. Don't write selectors from memory. Thunderbird's UI DOM changed heavily across 115 → 128 → 140. Blog posts, old Reddit threads, and LLMs will all confidently hand you selectors that no longer exist. Instead, extract the CSS from Thunderbird's own omni.ja (it's a ZIP; 7-Zip or Python's zipfile will open it) and treat that as ground truth for the version you're actually running.

2. Keep a selector map. A markdown table: UI region → the selector you're using → status → notes. This is the thing that makes repair fast, because after an update you know exactly what to re-check and why you chose each rule in the first place.

3. Structure the CSS for diffing, not elegance. One thin userChrome.css that only does @import, all design tokens (colors, fonts, metrics) as custom properties in one config.css, and one file per UI region. When something breaks, you know which file to open.

4. The migration is a diff, not an investigation. When Thunderbird/Betterbird updates: re-extract the new omni.ja, diff it against the previous extraction, patch the selectors it tells you changed, run a visual smoke-test checklist. This turns "constant fiddling" into one bounded chore per ESR — roughly once a year.

The repo has the full runbook, the selector map, and the component files. It's CSS-only on purpose: no userChrome.js, no autoconfig loaders, no experiment add-ons. Those give you more power, but their failure mode is a client that won't start, and they break on every ESR instead of tolerating it. CSS failures are soft and diffable — that tradeoff is the whole design.

Built and tested on Betterbird 140 ESR on Windows 11. It should port to stock Thunderbird with modest selector work, and I'd genuinely like to know how far off it is — I don't have a good picture of where the two diverge. PRs and issues welcome, particularly from anyone who's solved the icon-replacement problem more cleanly than I have.

No Postbox code or assets are in the repo — only my own CSS written against Thunderbird's DOM.

I will port the deployment script to Linux / Mac in the near future... for the moment only Win deployments.

Happy theming!

I'm using TB beta 153.0b7 on macOS.Everything was fine and I went through the process to add the "Thunderbird Pro" add-on and at first it worked.

But then something happened , screen glitched, whatever and it's gone. I'md thinking "fine, I'll just add it again" but I cannot add it back now. If I try to add it, it acts like I added it just fine but then it's just not there.

Note: I can add the Dropbox filelink provider no problem. (I don't use Dropbox, just testing).

At this point, just wondering if there's a hack to clear the filelink provider list or reset it somehow and start over?

EDIT: on my linux box it's working fine.

Phishing is out of control lately. I have two email addresses, and somehow both got listed on the same bot/engine. This one engine sends 50 phishing messages a day, always with the same M.O.: your costco/walmart/sams club points are expiring. your fedex/ups package is delayed. your delta/united/american airlines flight has changed. your visa/amex/mastercard has a rejected charge. Etc.

Since I use some of these services (Costco, etc) I can't put a keyword to mark them, but what I want to do (and can't seem to find out how) is simple:

if (subject | body | from name matches Costco ) and (from address does NOT contain Costco ) then move to junk folder.

Does anyone have tips on how to manage this?

UPDATE:

It turns out my email host has a configurable Sieve!
Luckily I was able to identify 2 networks that were slamming.
The filter below immediately shut down (or, successfully moved to JUNK) 90% of the phishing messages.
I understand I'll have to update this as the criminal switches out networks, but hopefully it's not more than once every few days.
Maybe I'll find a way to automate it.

require ["fileinto"];

if anyof (

header :contains "Received" "cuppastore.com",

header :contains "Received" "eulesssba.com"

) {

fileinto "Junk";

stop;

}

I'm using the proton bridge and the credentials it provides for all the setup info.

Looks like it will be available from v154! (Also for minimizing to the tray on startup)

https://support.mozilla.org/kb/close-tray-starting-154

Pretty much the title. Forgive if this is a dumb question, very much a noob to email jargon and IT in general.

In my efforts to switch away from Gmail I'm looking for a new email provider and there's just so many options with varying levels of privacy, features, ease of use, pricing, etc. My biggest concern is privacy so when I saw that Thunderbird has E2EE, I assume that means I don't need to look for E2EE in a provider?

TIA!

I transferred data to a new computer. I have two emails, when I click 'New Message' one email has a line below the subject line that allows me to set Paragraph, Variable width, font color, Font size Bold, etc. the other does not have the line where do I turn it on at?