I-Thunderbird Community Forum

I am setting up an I select "Invite Participants" the pop-up screen locks up.

I have tried to change accounts one at the time with no luck. I also selected the "Attendees" tab near the bottom of the pop-up. That did not help either.

This is running on a Windows 11 Home operating system.

Any help would be appreciated.

PS - I moved from Microsoft Outlook to Thunderbird as I did not like the new Outlook. This has been very frustrating.

Some of the messages in my inbox show the wrong information in the "from" and "correspondents" columns. Is there a way to get the correct information from the message to be displayed?

The 'new' Thunderbird doesn't allow a password entry in server setup and will not prompt me for one. It pops up a Windows toaster message saying it can't connect - obviously. I set the advanced options to not remember the signon but still no success.

Every 10 minutes, your Thunderbird app generates an attachment (nmsa) that McAfee deems a Trojan and quarantines it. I get 15-20 popups from mcafee every hour. If I close Thunderbird it stops. What can i do to stop this from happening?

Trojan:Win/SuspiciousAttachmentScript.a

C:\Users\ken_s\AppData\local\Temp

I'm currently making a custom theme for Thunderbird for my own personal use. I've gotten pretty much everything how I want it to look – except the main content. I prefer light mode for accessibility, and currently it's stuck in dark mode everywhere (my settings menu, calendar, mailbox, etc).

The first image is how it currently looks, and the second is how I want it to look (the black boxes are there to block sensitive info). What would I need to add/edit in my manifest.json and/or style.css to get there?

I have two Tbird accounts pmcreativeservices@rcn.com has been mine for 20 years, and it's what I use for bills, banking, etc. The other account is PatriciaRosemoor@rcn.com and is only used to collect messages that come from my author website. Yesterday, I got a message from someone who tried but couldn't put a book up at Amazon and asked if there was something I could do about it. My trying to send her a message via the PatriciaRosemoor account is what started requests for my Primary Password. One a minute after I cancelled the last one. I tried the two passwords I knew I had, but neither worked. I got a request for a new password so I did that and it didn't work either. I kept going back to it all day yesterday uselessly. I found directions of what to do online, but it didn't match up with my Settings information. Please, if you can tell me how to fix this, I would be grateful. Or, if I can keep the thousands of emails I probably have, I could try deleting the account and recreating the account. The problem would be how to bring all my saved emails back. Thank you for your help. Patricia

I have 8 TB emails. Every morning when I open email, all passwords need to be re-entered, sometimes 2-3 times a day. I have done everything YouTube has suggested and looked for similar issues and fixes on the forum, including creating an initial PW to open the main TB email account. No success yet! I have a PC; if that helps answer the question. I also recently downloaded an update, which did not fix it. Any suggestions would be appreciated. Thanks in advance! Carl

I used to use Foxmail as my email client. When writing emails with oversized images, I could right-click the image and select the "Auto resize it to proper size" option to make the image easier to read. However, I can't find the same function in Thunderbird. Do I need to use an extension, or is there another way? Can someone please help me? It's really frustrating.

Suddenly since Friday 21.08.2026 morning every single person in our company started to call the IT department that their Thunderbird client is printing out blank pages (white pages) instead of attachments from emails.

What is happening -> Employee gets email with PDF attachment -> clicks to open it in thunderbird print preview -> prints -> blank page comes out.

What works -> Downloading the PDF and printing it. Opening the PDF in any other browser than Thunderbird and printing it.

No settings or updates were changed and it's a big issue affecting multiple computers.

What I tried doing -> Trying different printer (No fix), Resetting print settings in thunderbird (No fix). Trying other PDF attachments from older emails (No fix). Looking at print settings in windows (Which I didn't change since it only doesnt work in Thunderbird).

Problem is that on thunderbird in my office, This doesn't happen. We have the same versions and settings.

I tried opening the error console while opening the PDF and on computers where it doesnt work it shows me an error with along the lines of "This document is open in compability mode due to **** header <doctype html>" Something like that but i would have to check again.

I don't get this error on my personal PC.

Here is the message I get. Very inconvenient... Sending of the message failed. An error occurred while sending mail. The mail server responded: Too many recipients. Please reduce the number of recipients and try again. AUP#Out-1550. Please check the message recipient "........" and try again.

I've googled "how to make Zimbra my default email on the Firefox browser. It said to hit the 3 bars on the upper right, then Settings, then General, then Applications. There is no General category. Please help me change the default email. Thank you.

Hello All, I'm desperately trying to set my uninstalled and reinstalled Thunderbird to have Body Text as default. All suggestions online are outdated and don't work since suggested places in settings and account settings are not existing anymore. I have a machine at home with Thunderbird and it has Body Text as default. How on earth can I get there? Thanks

Hello,

I have been using Thunderbird for years without issue, but three days ago, I started having issues.

Now, I don't receive emails when I open Thunderbird. If I delete my password and re-sign in, I receive emails, but cannot send them. Trying to send an email makes Thunderbird ask me to sign in again.

I have two email accounts that I use with Thunderbird. Both accounts have this issue. I have this issue regardless of the network I'm in (work, cell hotspot, or home).

Things I have tried:

• Verified that my IMAP and SMTP settings match the guidance from email servers.
• Verified that my computer firewall is not blocking email.
• Tried connecting on different networks (so different ISPs)
• Deleted and re-entered passwords for each account

Here my current server configuration:

• Email 1 (@gmail.com)

 * Server Name: imap.gmail.com
 * Port: 993
 * Connection Security: SSL/TLS
 * Authentication Method: OAuth2

• Email 1 Outgoing Server:

 * Server Name: smpt.gmail.com
 * Port: 465
 * Authentication Method: OAuth2
 * Connection Security SSL/TLS

• Email 2 (@[university].edu)

 * Server Name: outlook.office365.com
 * Port: 993
 * Connection Security: SSL/TLS
 * Authentication Method: OAuth2

• Email 2 Outgoing Server:

 * Server Name: smtp.office365.com
 * Port: 587
 * Authentication Method: OAuth2
 * Connection Security SSL/TLS

I will greatly appreciate any help you can provide!

I installed Thunderbird on my new laptop, then imported the profile from my old laptop

The main screen has, under "Inbox", folders for Drafts, Sent, Trash, Archive and Spam, which are being used by the program

Folders for Drafts, Sent and Trash also appear under "Local Folders" (along with Outbox) and these aren't being used by the program.

How do I get rid of these duplicate folders? "Spam" had a delete option, so that was easy, but the others don't.

I tried the two suggestions for a previous "Duplicates" question but they didn't resolve things.

Thank you

Have used Thunderbird for years and never had this issue before. Just upgraded to Thunderbird 115.18.0 esr and my calendar is now blank. Did the upgrade erase the data or is a pointer off somewhere? Can I get my calendar back?

What are the memory limits for Thunderbird. Currently, I get this message when I try to save and email "Unable to save your message to local folders. Possibly out of local file storage space." Please see attached screenshot.

I am not out of storage space.

Any suggestions?

Thank you.

Tom O'Brien

I want to copy my calendar from my Mac whrwe I use Week Calendar into Thunderbird Calendar, but I have not got it to work there. I read somewhere that Thunderbird art developing the calendar. Will it work now??