Thunderbird Community Forum

Thank you for your message. In my online account (IMAP), the "missing" folder is still there as usual. However, right-clicking it doesn't lead to the "Subscribe" option.

The folder is present in Outlook Web, but not in Thunderbird. Perhaps a checkbox is simply missing in Thunderbird.

I created a new address group, and it was created under Collected Addresses. I want to move it to another one of my address books. I tried drag and drop with no success, and there is no copy/paste option.

I am unable to send an email from Thunderbird to 2 hotmail accounts that I have been communicating with for several years. The issue has only recently started and I can send emails to them from another email account that I have on gmail and any other emails than these are fine from Thuderbird Below is the return message that I receive - can you help

   ""  This is an automatically generated Delivery Status Notification.      

Delivery to the following recipients failed permanently:

  * andyfmorris@hotmail.com

Reason: A message that you sent to the following recipient could not be delivered due to a permanent error. ** The remote server ?? responded with: ** andyfmorris@hotmail.com ??:?? This message was created automatically by mail delivery software on the server .

Reporting-MTA: dns; avasout-peh-004 [212.159.14.20] Received-From-MTA: dns; [192.168.1.81] [51.7.113.34] Arrival-Date: Tue, 17 Feb 2026 11:05:53 +0000

Final-recipient: rfc822; andyfmorris@hotmail.com Diagnostic-Code: smtp; 550 5.7.1 Unfortunately, messages from [212.159.14.20] weren't sent. Please contact your Internet service provider since part of their network is on our block list (S3140). You can also refer your provider to http://mail.live.com/mail/troubleshooting.aspx#errors. [Name=Protocol Filter Agent][AGT=PFA][MxId=11BCD72C9602F57A] [DU2PEPF00028D0F.eurprd03.prod.outlook.com 2026-02-17T11:05:53.185Z 08DE6B964EE3CE26]

Last-attempt-Date: Tue, 17 Feb 2026 11:05:53 +0000 ""

Hi!

I've added some subfolders to my inbox on my laptop but these folders dont appear or sync on my phone, I've checked all settings and they seem to be in order. Can you point me in the right direction to fix this?

Cheers,

Henk

After an email update this morning, I went in to look at an old email and nothing was there. Checked all my other folders and they were all empty. How and/or can I get them back. Some were ones that I did not need to loose.

None of the topics suggested fit. I'm having trouble with getting extensions on toolbars. In the customize toolbars window there's a toolbar at the very top of the page that starts with mail, calendar, addressbook, etc. Just for example, the Google Calendar and Outlook Calendar extensions are in that toolbar, but I can't move them to another toolbar and that toolbar disappears when I close the Customize page (either way) and I haven't been able to find a way to get it displayed in other places. That toolbar is very similar to the toolbar that appears on the left side of the Thunderbird window, but that one doesn't include the extra extension buttons that I mentioned above.

Some people in various places have suggested that customizing Thunderbird toolbars is done the same way as in Firefox. But I haven't been able to find a puzzle piece icon anywhere.

By the way, I used to be able to add more toolbars, which I found to be an attractive concept, although that implementation didn't always work so well.

I have been using Mozilla Thunderbird for decades and they have even contributed a small amount of money to Thunderbird periodically. Just within the last two or three days all of a sudden I have been unable to send emails with my phone. I receive emails, but I do not send them. So I opened up a laptop where I did not have Thunderbird and set it up properly through Spectrum using the incoming and outgoing servers as mail.twc.com. and yes, just like on my phone. I continue to receive new emails, but even with the laptop I was unable to send an email. I received the message"send message error sending a message failed. The message could not be sent because the connection to outgoing server smtp mail.twc.com was lost in the middle of the transaction. Try again."I contacted Spectrum twice and both times they had me try to send a message through their Web server spectrum.net and that message did go through. Of course then their response is that this has to be a problem with the third-party app meaning Mozilla Thunderbird, and they can’t help with that at all. I sure would appreciate some help because I hate to walk away from Thunderbird as well as change my email address after all of these decades.

ho appena inviato un post, replica ad una vostra risposta... purtroppo ho concluso con il button "solved the problem" ... per favore, ho giusto ri-raccontato il guaio, non è per nulla solved... non mollatemi, grazie. Giorgio Chiantore, 10015 Ivrea.

My Outlook account moves what it thinks are spam/marketing messages into a "Junk" folder. Sometimes there are important messages here that I must mark as "Not Junk" so that I can continue to receive new messages from this sender in my InBox. I cannot map this Junk folder into Thunderbird even after I go through the steps and checkbox this folder to be synchronized. It does not appear in the left-side "All Folders" section.

Many solutions suggest that I make changes in "Settings\Privacy & Security\Junk" section. This does not exist. There, however, is a "Spam" section. Is this the same functionality?

Further, under "Accounts\Spam Settings\" there is a "Destination and Retention" section. There is no "Junk" folder available under "Other".

Does anyone else have problems linking server-side Junk folders into Thunderbird?

Thank you in advance for taking the time if you replied, Tim

ps. I've googled this extensively, and all the presented "solutions" are not accurate as the Thunderbird "junk" options they refer no longer exist. Has there been recent UX changes, and this is now a lingering bug?

I am really in a panic: Using ubuntu 22.04 and Thunderbird 140.7.1.esr For my main account I keep some 40 sub-folders and sub-sub-folders. All but the most recent mails in my sub folders are gone, something like 4 years of email. I asked chatGPT for help and found inside the /mail folder that most of the files with the names of my sub folders with no extension have 0 kb. I don't use IMAPS because I wanted my mails on my computer so I use only POP. :-( The interesting thing is that this only happend to my main account. I have 6 more accounts in Thunderbird and they seem to be fine, at least for now. Thank you for any help. Kind regards Frank

Trying to send mailmerge. Thunderbird version 147.0.2 (64-bit) I have sent a mailmerge from thunderbird before, so it should work. I have my CSV ready, and I type the email draft. I click the mailmerge icon, and fill out the mail merge dialogue box. After I fill out Mail Merge dialog box and click send, a blank dialog box opens, then I can't do anything (my email draft is frozen)tried sending, and saving, or pressing load (all options highlighted in screenshot). See also screenshot of blank dialogue box and frozen message. I tried closing the blank dialogue box, but the mailmerge is not sent, and after that, I can create a new message, but the mail merge option is greyed out, so I cannot select it. So I shut down Thunderbird and restart, then I can click the mail mergeicon,but same problem,I only get as far as the blank dialogue box. Thank you so much for your help

Every 2 or 3 days, Thunderbird tells me it needs to be updated. I run the update but halfway through it stops and tells me that I have a newer version on my PC. Why can it not recognise that I am up to date?

The month at a glance format was great. This new format(s) Feels like you fixed something that was not broken. I liked the old format. How can I get back to it?

My Thunderbird email account no longer lets me send out messages. I get a message error

  QUOTE____

Sending of message failed. An error occurred while sending mail. The mail server has responded. Message contains bare CR and is violating 822.bis section 2.3. Please check the message and try again.

But I am able to receive messages.

Can anyone help. Thanks in advance!!