Adding remote address book in Thunderbird

I just installed Thunderbird on a new computer. I hadn't used Thunderbird in some time. I can't seem to add ANY remote address books. There is an option to add an addr… (read more)

I just installed Thunderbird on a new computer. I hadn't used Thunderbird in some time. I can't seem to add ANY remote address books. There is an option to add an address book account. When I click on it, I get a dialogue box which lists several options which get highlighted whenever I mouse over then, however, when I click on ANY of the options, nothing happens.

How, then, can I add a CardDav address book to this?

Asked by ArekS 16 minutes ago

Why Emails not together?

Hi, at the top of the picture are 6 emails. Towards the bottom, highlighted in blue, is another email, RPAiken4@gmail. How can I get that one to be in the group of 6? … (read more)

Hi, at the top of the picture are 6 emails. Towards the bottom, highlighted in blue, is another email, RPAiken4@gmail. How can I get that one to be in the group of 6? TYIA

Asked by richardCPreston 3 hours ago

Last reply by richardCPreston 28 minutes ago

New Message button no longer works on TBird.

I am on W11 home. Tbird user for maybe 10 years. Just updated to 140.0.1. The New Message button does not respond to anything -- left, right mouse, alt control shift bu… (read more)

I am on W11 home. Tbird user for maybe 10 years. Just updated to 140.0.1. The New Message button does not respond to anything -- left, right mouse, alt control shift buttons. zip.

Asked by Dennis DeMattia 34 minutes ago

Unable to change Thunderbird default font size

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 Se… (read more)

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!

Asked by Ben Harland 1 hour ago

Last reply by Ben Harland 57 minutes ago

Sent folder inside Inbox

On one of my Thunderbird email accounts, my Sent folder is inside my Inbox instead of being parallel to the Inbox folder. How can I move it outside of Inbox? (My Account … (read more)

On one of my Thunderbird email accounts, my Sent folder is inside my Inbox instead of being parallel to the Inbox folder. How can I move it outside of Inbox? (My Account Settings -- Copies & Folders seem to be set up correctly.)

Asked by Ken Johnson 2 hours ago

problem with copies and folder, and place a copy in sent folder setting

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 undersan… (read more)

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

Asked by michaeljnewt 2 hours ago

Installing a stubborn email account

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 s… (read more)

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.

Asked by Don Luenser 2 days ago

Last reply by Don Luenser 3 hours ago

Help please - Thunderbird not fetching POP messages

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 se… (read more)

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!

Asked by cten 1 day ago

Last reply by cten 3 hours ago

Thunderbird stopped connecting with email provider, won't accept existing password.

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… (read more)

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.

Asked by Richard_Y 1 day ago

Last reply by Richard_Y 5 hours ago

Customize Thunderbird UI

Hi, Is it possible to change the Thunderbird folder pane (folderTree) appearance to look like the Thunderbird 102 style shown in your screenshot (smaller, more compact,… (read more)

Hi, Is it possible to change the Thunderbird folder pane (folderTree) appearance to look like the Thunderbird 102 style shown in your screenshot (smaller, more compact, and using simpler icons). Like imge below this


I using thunderbird version 115.10.1 and i try use CustomCSSforTb but it only change icon and colors. I cant change the tree folder style.

Asked by Tsss Teas 12 hours ago

Last reply by Tsss Teas 12 hours ago

Merging Thunderbird profiles

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 compute… (read more)

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

Asked by illinichip 1 day ago

Last reply by illinichip 16 hours ago

Error when opening saved .eml file

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… (read more)

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.

Asked by kanas 2 days ago

Last reply by kanas 16 hours ago

Drag and drop a folder into another folder opens target folder

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 … (read more)

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.

Asked by SadFirefoxUser 2 days ago

Last reply by SadFirefoxUser 20 hours ago

when i opened tbird on windows 10, it showed a start page/donation page, and can't see messages (Bug1975299)

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. wh… (read more)

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???????

Asked by JJA 1 week ago

Last reply by JJA 21 hours ago

How to change background color of New Message screen from white to someting else?

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… (read more)

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.

Asked by Electrojim 1 day ago

Last reply by Electrojim 1 day ago

128.12.0esr 32 bit not delivering mail if attachments added. Works if images are appended

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. … (read more)

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.

Asked by eadym 2 days ago

Last reply by eadym 1 day ago

failure when i copy .Thunderbird for backup "datasystem does not serve symbolic links"

By creating a backup from the .Thunderbird in Ubuntu 22.10 LTS i've got a failure "datasystem does not serve symbolic links". The file "lock" in dkfjslf.default couldn't … (read more)

By creating a backup from the .Thunderbird in Ubuntu 22.10 LTS i've got a failure "datasystem does not serve symbolic links". The file "lock" in dkfjslf.default couldn't be copied. I think, it will not be a problem, but it ist irritäting to get such a message, and it isn't named in the help files on this website. By the way, there is no chapter about backups. so it is difficult to find any articles about that.

Asked by JochenR 1 day ago

Thunderbird cannot use another IMAP archive folder

As Outlook online and the mobile app are using a different archive folder than Thunderbird (128.12 on Win 10), I set TB to use the same folder as Outlook (similar problem… (read more)

As Outlook online and the mobile app are using a different archive folder than Thunderbird (128.12 on Win 10), I set TB to use the same folder as Outlook (similar problem to here: https://support.mozilla.org/en-US/questions/1168534). But TB is ignoring it and even after unsubsubscribing and deleting the TB archive folder in Outlook, TB is recreating it after archiving the next e-mail. It also ignores the option to put all the mails in one folder and instead creates a one for each year. What can I do?

Asked by john.guitarman 1 day ago

Unable to View Email Contents

Hi, I use Thunderbird as my e-mail client and have been saving e-mails from the inbox into a shared folder on my internal server for many years now. Normally, when I do… (read more)

Hi,

I use Thunderbird as my e-mail client and have been saving e-mails from the inbox into a shared folder on my internal server for many years now. Normally, when I double click to open an e-mail saved into the shared folder, the e-mail will open in Thunderbird and I can click reply, forward, etc. However, since June 17, 2025, whenever I open these e-mails saved in the shared folder, only the subject of the email and two rows of menu bars (i.e., File, Edit, View, Get Messages, Write, Tag, etc.) appear, but the contents of the e-mail do not, including sender information. I've attached a screenshot so you can see what I mean (ignore the black background which I have set). Even though I can click "Messages" --> "Reply" in the menu bar, the composition window that pops up does not show any details of the e-mail I am responding to. However, if I transfer the e-mail file from the shared folder on the internal server to anywhere in my computer, say, the Desktop, the file will open normally in Thunderbird and display all contents normally. Would appreciate it if anyone could help me figure out how to solve this problem. My colleagues and I all need access to these e-mails saved in the shared folder so we can't keep saving them on to our computers. Thanks so much!

Asked by Caroline Wong 1 day ago