Thunderbird Community Forum

I have tried to add this address to my address book. Normally, one clicks on the icon and a pop-up appears to modify information and confirm entry into address book. This address always shows up as "not in book," clicking has no apparent effect, until one checks the address book and now duplicates exist.

First image you can see that Freeman is in the address book Second image you can see that Tbird thinks the address is not in the book Third image after I've clicked and no apparent action is taken, a duplicate appears.

When this bug first appeared I had clicked on the icon multiple times, and multiple entries appeared in address book. I deleted them all, tried again, bug still happens.

139.0.2

In microsoft word i have a number of abbrevs that i created (mostly in french, my language) such as bmbm : Bonjour Monsieur, Bonjour Madame, bcdt : bien cordialement mda : merci d'avance etc... there is'nt that many entries so i dont really need to IMPORT (which i have been trying for hours) , i'd be happy to enter them manually again in Thunderbird (im using version nr 91 at mom) but i cannot find out HOW ? tks for your help !

Hi grateful for any help with this please,

When I set the copies and folders setting to place a copy of all sent messages to my email address (IMAP server as i undersand it) it looks fine, but when I actaully send a message andthen look back at the setting it has changed to 'local folders' so the copy is only on the local laptop not accesible elswhere.

This isn't a problem wih an old version of Thunderbird: 102.13.1 (on an old laptop) but on 140.0.1 on a newer machine the problem is there...

Thanks John

When I click on a folder with multiple messages, each of which has a thread with multiple messages, all of the threads are automatically expanded. If I collapse each message thread, leave that folder, then return to that folder, all of the message threads are again fully expanded.

Is there a way to stop this automatic thread expansion each time a folder is opened?

Windows 11, Thunderbird 140, How to increase the"New Event" box and its Font

- Windows 10, the size is OK

- I have 'Googled" this problem and there seems to be no answer.

Kind regards: Gary Shaw

In Windows 11, Thunderbird 140, how do I increase the font size in new events box?

- I have tried to make the changes in Windows 11 settings (text size) and this has not helped. - I never had this problem in the past when using Windows 10.

I have "Googled" this problem and had no results.

Kind regards: Gary Shaw

Hi =)

When I click "Write" and compose an email, the text I type is very, very small. I have tried all the settings in the font settings, etc. I can choose a larger font, but then the text becomes very large for the recipient as well. It can't be correct that the text should be so small, it is hard to read it, that small is it. This happened after reinstalling the new version of Thunderbird this evening. When the email is sent it is ok size. See enclosed pictures:

1) When writing -> Too small 2) In the inbox -> Ok size 3) Email is opened -> Ok size

I really hope someone can help! =)

Best regards, Margrethe

My filters seem to work for emails received but not for ones I've sent. I use the rule "From, To, CC or BCC" combined with a persons email name (i.e. preceding the @ sign) and while From works the To doesn't and remain in my sent folder. Periodically I have to use "Run Filters on Folder" or "Run Now" from within the Sent folder to move everything to their respective folders. Do I have to have a separate rule just for "To"?

Greetings,

I recently updated to Thunderbird 140. After the update, I am unable to open .eml files by double clicking on them. I receive message window (attached image). If I do File->Open->SavedMessage I can successfully open the file. Please advise how I can get Thunderbird to open .eml files regardless of the instance of Thunderbird that originally created the file.

when i oppened tbird on windows 10, it showed a page to obly my for a donation. i had made a donation short ago, but eventhough, i just made another one time donation. when i open tbird again, i can not get out of the donation page. what should i do please???????

I shut down my computer on July 6th, went to bed, woke up on July 7th, opened my email to find all of my emails are gone. I had my daughter try and help and the app asked to set up an account. I (grandson) can find the profile and when I dig deeper in Mail I see 4 different inbox folders.

How do I get it to read the older inbox folders?

I have backed up the profile and deleted folder -3.net to try and get it to read the -2.net folder, it just recreates the -3.net folder and the emails only go back to 6/13/25. When I read the other .msf file in notepad I can see the archived emails dating back to 2020-2017. Even found the other folders that were under inbox.

I have followed the instructions provided here: https://support.mozilla.org/tn/questions/1397110

1. Keep settings in Settings>Composition at default (medium) 2. In Settings>General>Fonts & Colors>Advanced, change Latin Proportional and Monospace to 22 3. In Settings>General>Fonts & Colors>Advanced, change Other Writing Systems Proportional and Monospace to 22

The fonts in my messages are still tiny. What is the 2025 solution please?

Thank you!

I have a Suddenlink.net email account that I can't seem to install. Suddenlink has been purchased by Optimum. I have all the requirements that Optimum has given, but it still won't load. my email address is dluenser@suddenlink.net. My password is correct because I can go to their site and get my emails. These are the requirements that they gave me. Again, it is a suddenlink account. Can you help? I've tried numerous times to work with Optimum techs, but they are not knowledgeable to what I should do.

Server Settings by Domain Use the following server settings to set up most third-party email clients or applications to send or receive Optimum email. IMAP (Inbound) Optimum incoming mail server: mail.optimum.net Suddenlink incoming mail server: imap.suddenlink.net Incoming mail port (SSL): 993 (Secure Connection. Recommended if your mail client supports) POP (Inbound) Optimum incoming mail server: mail.optimum.net Suddenlink incoming mail server: pop.suddenlink.net Incoming mail port (SSL): 995 (Secure Connection. Recommended if your mail client supports)

SMTP (Outbound) Optimum outgoing mail server: mail.optimum.net Suddenlink outgoing mail server: smtp.suddenlink.net Outgoing mail port (SSL): 465 (Secure Connection. Recommended if your mail client supports) • Check My SMTP server requires authentication Username and Password (if needed) User Name: Your full email address, including the @domain.net at the end (i.e. @optimum.net, @suddenlink.net) Password: The password for your particular email address • Outgoing server verification/authentication must be enabled and on. If your email client has the option or checkbox that says My outgoing server requires authentication this will need to be checked along with use same settings as my incoming mail server.

I'm having an e-mail emergency, and will be very grateful for any assistance. Running TB 128.12.0esr (32-bit) on a 64-bit Win10 PC.

Earlier today, Thunderbird stopped sending or receiving via my main account, on an Earthlink-hosted domain that I own. Turned out that I can still send from accounts on two other domains, one a shared-hosting domain that I own; the other is Verizon/AOL. But I cannot seem to download from any of the three domains.

I checked all the SMTP and POP settings, which worked a few hours ago and have not changed. Restarted Thunderbird several times, inlcusing in safe mode, and rebooted the PC twice. Clicking "Get Messages" - globally or by account - does nothing. The thin blue "working" bar at lower right keeps scrolling, even if I press the Stop button.

I would prefer not to mess around with setting up new profiles and all. Can anyone here please suggest anything less complicated and risky that might get mail working again?

THANKS in advance!

We have Thunderbird set up to auto-connect to Plusnet's "Force9" emails, using a saved password, on a desktop machine running on Mint. It's always worked fine until today, when it gets to "Host contacted, sending log-in information"

then after a long pause a box pops up with,
"sending of password for user [ xxxx] did not succeed. "

It offers me the option of entering our password manually, which gets the same result.

If we log in on Firefox via their webmail portal, using the same password, it opens well enough, it's just much more clunky and slow to use than Thunderbird normally is.

Any advice will be welcome, please. Thanks.

My old Windows10 computer died, but I have an external backup with my Thunderbird profile folder. In the meantime, I have been able to resurrect an old Windows10 computer to continue receiving email, but was not successful transferring the backup profile. Thus, I have "new" profile on this second computer containing only the recent emails not in the backup profile.

I've purchased a new Windows11 computer. My question is: How can I merge my old emails in the backup profile with the recent emails received after the backup was made? In other words, is it possible to merge two separate profiles into one? Thanks.

Illinichip

Dragging and dropping a folder into another folder opens target folder. It shouldn't do that. The target folder should simply accept the folder being dragged into it and stay closed, as it always did since inception until a few versions ago. It is sooo annoying to always have the target folder fully expand when I have not desired it to do so! How can I prevent that from happening? Any help much appreciated.

I've got Windows 10 set up for a custom 'blank page' background color through a registry edit; I find a light gray-green much kinder on the eyes. This color came up just fine on a New Message (compose) page in Thunderbird until yesterday, but seems to have been broken by a Windows 10 Update yesterday (7/9/25) to Version 10.0.19045. My custom color still appears behind Microsoft system and app pages (Word & Excel), but no longer is the background for Thunderbird or Firefox, although it does appear behind address bars. Any ideas on why or how to fix would be most welcome.

I cannot deliver emails with attached images. This has only started being a problem with upgrade to Win 11 64 bit 24H2. The message shows up in sent with the image.