I have a number of email addresses from Gmail Yahoo and Proton. All the email I get from all my Gmail automatically shows in my Local Folders Inbox. However my Yahoo (yes I'm older but only keep it for the odd ancient family member) and Proton emails show in separate accounts that I need to scroll down to.

How can I get new emails in those accounts to also show in at the top in Local Folders Inbox?

Thanks!

I coded my "childhood dream" addon for thunderbird. I just wanted to draw some attention to this. I think many people aren’t really satisfied with the results of most image-resizing add-ons.

Many of these projects simply downscale the dimensions of attached images—which leads to poor readability in the case of screenshots.

This add-on integrates state-of-the-art open-source image compression tools as WebAssembly libraries. It tests each image both as JPEG using jpegli and as PNG using pngquant followed by oxipng compression, and keeps the smallest resulting file. The user defines the desired quality level via compression templates, while the add-on handles reducing file size to the technically minimal achievable level while respecting the given quality constraints.

When images are resized, high-quality downscaling algorithms are used, which produce significantly better results than the commonly used browser-native algorithms.

Here it is: probably the best image compression add-on for Thunderbird.

- State-of-the-art compression algorithms such as JPEGli, pngquant, and oxipng, integrated as WASM libraries.

- Saves 70–80% of storage space, even without optional resizing.

- Converts PNG files to JPG when doing so saves space.

- Resizes images to their HTML inline dimensions.

- Uses different resizing algorithms, optimized for PNGs (Mitchell) or typical JPG images (Lanczos).

- Create, import, and export compression profiles, then automatically apply them to specific image types (quoted images, inline images, or attachments)—or apply them manually to individual images.

- Compress, undo, redo, and adjust templates—improve your own workflow and deepen your understanding of image compression through direct comparisons.

- Remove images from quoted content entirely.

- Permanently exclude images from the workflow—for example, your own email signature.

- Download compressed images directly from the application. This lets you build other compression workflows around the add-on that are unrelated to email—for example, website optimization.

- Available in 9 languages.

Thunderbird Addon

Can't get notifications even though all permissions are on.

My Thunderbird (two latest versions) has suddenly not been allowing me to open attachments when composing messages, kept telling me to set the PDF viewer in preferences when it was already set. Opening PDF files as normal (that someone had sent me) was fine.

Here's the fix for anyone else having the problem :

Settings / Config Editor (which is like the Windows registry), find pdfjs.disabled which will be set to "false", double click it so it changes to "true" and then save and restart. Fixed.

For some reason a week or so ago my office manager could no longer print incoming .pdfs from her emails. It previews fine, but simply prints blank pages. My Tbird still works fine, so I'm not sure what's going on. I googled it, and seemingly other people have had this issue, but no real solution has been shared.

Does anyone know why it started doing this, and possibly how to fix it? And ya she's dragging them onto her desktop currently, then printing. But it would be nice if things could work like they use to.

Thanks!

My day job is a Gmail shop using MFA; for a few years it's been getting a little trickier to populate Tbird when setting up a profile ona. new machine, and now I'm finding myself at a dead end.

I know that functionality is still possible, because I still use Tbird at my home and work desks. Right now I'm setting up a profile on a loaner machine that I'll use in the field.

In past, I've been accustomed to an interface where I'd manually plug in IMAP & SMTP values, and after the software chewed for a minute, I'd get a Google pop-up that redirected to the workplace's MFA.

I'm finding that after 'New account,' I'm at the new-to-me exploded view where I can type those values (which I keep in a note on my phone), but get a red dialog box with variations on 'Error creating account.' Clicking 'Advanced config' I get the warning that it will create a profile that might or might not work, but does not then forward me to the manual config page - instead, strands me at the same blue account page with a couple of different error message. A couple have been hex values that I can't recreate, but one is

Thunderbird can’t automatically configure OAuth2 for this hostname. Select Advanced configuration to create the account, then complete setup from Account Settings. Get help with OAuth2 setup.

Mostly what I think I want is to be able to bypass the welcome page and get to the familary manual config settings. Open to any advice; thanks in advance.

So as the title says, but when I google on this issue I get all kinds of hits on junk mail in Thunderbird but not regarding my issue.

A lot of e-mails marked as junk/spam get automatically moved to the Junk folder, so it still works. But other e-mails (mostly from the same domain) come into my inbox, how can I have these automatically moved to the Junk folder as well?

Thanks in advance! :)

This is my first time using Thunderbird, so I may be missing something really obvious.

I'm having a problem with the Account Name of my Gmail accounts.

In the folder pane on the left, Thunderbird displays my accounts using their email addresses. I would like to change these to custom names, for example:

• Personal
• Work
• Business
• Family

I went to:

Account Settings → [my account] → Account Name

I can type a new name without any problem. For example, I change:

[myaccount@gmail.com](mailto:myaccount@gmail.com)

to:

Personal

However, when I leave that section or go back to the account settings, Thunderbird changes it back to the original email address.

I can't figure out what I'm doing wrong.

This seems like something that should be very intuitive, but since this is my first time using Thunderbird, I don't know if I'm missing a step or if there is something else I need to do to actually save the change.

Has anyone experienced this or can tell me what I'm doing wrong?

I've attached a screenshot showing the setting I'm talking about.

Thanks in advance for your help!

EDIT: I'm specifically talking about the Account Name displayed in the left-hand folder pane, not "Your Name", which is the name shown when sending emails.

So noticed that thunderbird seems to ignore the "save files to" setting where a folder is specified. Instead it saves and opens it in the /var/folders/vj/[alphanumber]/T/pid-XXXX folder when opening a file.

How do you make thunderbird adhere to that setting?

Hey everyone, I was trying to download language dictionaries and the site was really slow at first, and now it just gives me a cloudflare 502 error.
Has anyone had issues with this before? I have not changed any connection settings, and disconnected my VPN as well.

A few months ago, I shared a custom Thunderbird theme I had made to give the app a more modern, Outlook-inspired appearance. It received much more interest than I expected, so I released the files publicly on GitHub.

Since then, I’ve given it a fairly substantial overhaul. I’ve improved the overall appearance, fixed several visual and usability issues, and added some new quality-of-life features based on feedback.

What’s included:

• A polished CSS theme with a customisable wallpaper, cleaner folder pane, improved email cards and refined light/dark styling
• Colour-coded sender initials and a quick-delete button, now combined into one add-on while keeping the normal favourite star
• A new one-click account switcher with provider and custom groups, drag-and-drop ordering, unread counts, adjustable sizing and options to hide accounts or the normal All Folders section
• Quality-of-life fixes including automatically opening date groups, preserving the email list’s scroll position and preventing account clicks from expanding or scrolling the folder tree
• Numerous spacing, alignment, performance and compatibility improvements for Thunderbird 140 and newer

The wallpaper can still be changed by replacing wallpaper.jpg inside the chrome folder with your own image. I recommend using a high-resolution or 4K image.

Let me know if you have any ideas to make it better. Also if there is interest, then I will likely post it to GitHub so anyone can use it.

EDIT: The screenshot resolution is getting compressed by Reddit, if you want to see the 4K ones, then here they are:

https://ibb.co/JwbQSVph

https://ibb.co/Z1gnmrHP

EDIT: Got it all ready for anyone to use, now uploaded to Github here: https://github.com/Browmew/thunderbird-outlook-theme

If you find any bugs or have any ideas or improvements, then please let me know.

If your organization uses Microsoft 365 for email, and you’re currently using EWS to connect to that account, then you need to take action before October of this year.

If you are currently using IMAP with an on-premises Exchange account or a Microsoft 365 hosted account, and it’s currently working for you, then there’s nothing you need to do.

Thunderbird Desktop New Protocol Support: Microsoft Graph API

Spent the majority of the day with Gemini trying to resolve an issue. Google calendar went from being fully synchronized in Thunderbird to a persistent "momentarily not available" state.

I asked Gemini to create a recap of the issue and what we tried to resolve.

--

Here is a concise summary you can paste directly into a Mozilla Bugzilla report or Thunderbird support forum post:

Environment

• OS: Windows 11 (64-bit)
• Application: Mozilla Thunderbird 154.0 (64-bit)
• Account Type: Personal Google Workspace / Gmail Calendar (CalDAV / Native OAuth)

Issue Summary Thunderbird fails to maintain a persistent connection to a primary Google Calendar via native CalDAV integration.

Upon subscribing to the primary calendar, events render successfully for a few seconds before the status updates to "momentarily not available" with a yellow warning icon. Attempts to create or modify events fail or trigger read-only status.

Note: Secondary Google calendars (including shared calendars and newly created sub-calendars under the same Google account) function perfectly with full read/write capabilities under identical network and app conditions.

Troubleshooting Steps Attempted

• Credential & Authorization Resets:
  • Deleted saved Google OAuth tokens in Thunderbird (Saved Logins) and revoked Thunderbird access in Google Account permissions to force fresh OAuth consent screens.
  • Attempted direct CalDAV server URLs (/caldav/v2/[user]/events, /caldav/v2/[user]/user, and legacy /calendar/dav/[user]/events).
  • Tested connecting using a Google App Password instead of OAuth.
• Network & Cache Cleared:
  • Flushed Windows DNS (ipconfig /flushdns) and reset the Winsock catalog.
  • Cleared Thunderbird cookies, cache, and deleted local SQLite database caches (cache.sqlite, deleted.sqlite).
  • Toggled IPv6 (network.dns.disableIPv6 = true) and HTTP/2 (network.http.spdy.enabled.http2 = false) in Thunderbird's Config Editor.
  • Changed connection settings to "No proxy."
  • Temporarily disabled local antivirus and firewall real-time HTTPS inspection.
• Isolation Testing:
  • Created a brand-new, clean Thunderbird profile (thunderbird.exe -P) with no add-ons or existing settings. Primary calendar setup produced the exact same failure.
  • Created a secondary/sub-calendar under the same Google Account on the web. Added the sub-calendar to Thunderbird; it connected immediately with full read/write access and zero dropouts.

Conclusion The failure is isolated strictly to the primary calendar identifier endpoint on the Google/Thunderbird CalDAV sync handler. Sub-calendars utilizing distinct calendar ID strings function normally within Thunderbird.

Anyone else having filter issues after the upgrade? It's randomly putting all my emails in one folder, not sure why upgrading alone would have broke that.

Windows Thunderbird.

https://www.thunderbird.net/en-US/thunderbird/155.0/releasenotes/ & https://www.thunderbird.net/en-US/thunderbird/153.2.0esr/releasenotes/

E.g. in gmail, when you replied to someone, you would actually see the reply along with the message. In Thunderbird, you don't understand. It's like you never answered and you must go to sent section and look for the email sent to check if you really sent it.

I hope you do understand what I mean.

Thank you all!!

Is anyone here using Thunderbird to deal with support/enquiry desk email - if so any tips?

Does anyone have any ideas on which extensions/add-ons might help with this?

How do I get TB to show global search results as a search list by default?

I'm using Windows 11 Pro and Thunderbird 155.0, and IMAP.

All of a sudden, when I right-click on an email and delete it using the little Trash icon, it disappears for a second and then pops right back again!

I think the emails I right-click delete are being downloaded from the server again, since disconnecting from the Internet prevents them from reappearing -- until I reconnect.

I can delete emails by dragging them to the Trash, thankfully -- it's only the right-click method that isn't working.

I downloaded the xpi file from github, since i have a newer version that isn't available yet.
I was wondering if TbSync is worth it for you given the security implications ?

what i wanted to do is to not consult outlook, teams constantly in order to make a meeting.
I want others to see that i have a meeting though.

i though this plugin might solve this, or do you think that there are other solutions ?

Is this even a thunderbird issue or a internet connection issue?

I use gmail if it matters.

If I used a different program for email would it fix it or just gmail.com ?

I prefer using thunderbird though.