Thunderbird Support Forum

I keep getting "Undelivered Mail Returned to Sender" messages when sending emails from Thunderbird to Gmail accounts. Can you help? I am using Thunderbird 102.11.2 (32-bit) as POP mail server with email account through pairserver.com (SSL/TSL with normal password). I can send to Gmail accounts with no trouble directly from webmail.pair.com.

A problem I run into a fair bit is having legitimate emails going to my spam folder. I've added the email addresses to my address book and I've moved the emails into my inbox hoping Thunderbird would get the hint but neither has helped. I'm not sure how to address this and I'm hoping someone has a solution.

I'm a long time user of Thunderbird Version102.11.2 and now I am perplexed .. Using Windows 11. My primary business accounts are Outlook 365 through GoDaddy. All has worked well until last night. Thunderbird is set to check for mail every 3 minutes. If there is something to download it does. If there is nothing to download I get:

Sending of password for user jeff@xxxxx.net did not succeed. Mail server outlook.office365.com responded: Authentication failure: unknown user name or bad password.

If I click " get messages" sometimes it does and sometimes it doesn't and I get the same or similar messaage.. If I try to send email I get

"Login to server outlook.office365.com with username jeff@xxxxx failed."

Its not a password or login issue. Emails go to phone and tablets just fine

Other accounts with other servers are working fine ..its just the Outlook 365 accounts. Something changed somewhere but my limited skill can't figure this out.

Thoughts/suggestions ?

Hi,

Since the latest update today 102.11.0 (64-bits) my Thunderbird on Windows 10, freezes when receiving mail. I did a new install but that did not help, I have turned off every email notificiation, that also didn't help.

I have asked my ISP but they have no server problems with my imap account. On my phone, with a different program, I have no problem at all.

Is there anything I can do to get this fixed?

Thanks !

I recently have been unable to send email using the Thunderbird email client with my Outlook email. (See attached screenshots for error and settings).

I am on Windows 10 Pro 22H2. Thunderbird version 102.11.2.

I've tried disabling Windows Firewall but that doesn't seem to help. I also have Thunderbird on my laptop and it works fine.

Let me know if I can provide more info, thanks for the help!

Hello

I'm running Thunderbird 102.11.0 with Gnome 44.1 and the Wayland windowing system on OpenSUSE Tumbleweed. The first time I launch the application after a restart it always hangs with a blank window titled "Home - Mozilla Thunderbird". The same thing happens whether I launch the application using the shell or the desktop icon. If I close the blank window and try again then the application always launches correctly on the second attempt.

This issue started about 4-6 weeks ago before that I never had any problems launching Thunderbird.

Any ideas on how I can debug this?

Cheers Norman

Hello I am new to Tb but I have problems with GMAIL, the synchronization works fine from the server, I can move emails to any folder, send them to the trash and delete them and it syncs in TB, but when I do the same from Tb this does not work well when I move an email to the trash and then delete it from TB it is not deleted in Gmail and stays there until I close TB. The configuration I have is IMAP. and the problem gives me with Gmail because with zohomail it works correctly. What am i doing wrong?

Problem started several days ago......driving me nuts ! Win 10 / X64 / Thunderbird 102.11.1 Comcast e-mail I use Malwarebytes and Norton

I can download from Comcast all my mails with no problems to Thunderbird. I can send New e-mails from Thunderbird with no issues.

However if I use REPLY or FORWARD to send a message I get an error box saying to check my settings. All y settings are fine because I can receive and send messages ( new ones) with no problems. It's only the reply and forward functions that give me the problem. Enclosed is screenshot of the message I get. Tried clearing cache as well as several other minor repairs to no avail. Any suggestions ?

Vlad

Need to determine why some emails sent to me (from me) do not show in my inbox. If the same email was forwarded to me from someone else, it looks like it comes in (unread mail count increases), but it does not show in the inbox. A search for the email finds it but it does not show in the inbox. Very odd behavior. Only does this for one account of several we have.

Hi, I've been having trouble with Thunderbird for a few days now.

I recently turned on and updated my laptop, which shares the same thunderbird accounts as my desktop. I had to update Thunderbird and log back into my google accounts because it had been some time since I last used that device. I noticed that I wasn't receiving emails on my desktop anymore. I did some research and tried applying fixes that I read online.

So far I've tried: Deleting my saved passwords > didn't work Removing the account entirely and re-adding it > Thunderbird failed to find the settings for your email account. Uninstalling Thunderbird and deleting any saved profile data > Same as above.

I did install a new router, a Netgear Nighthawk but I'm not sure if this is the cause of my trouble as both my mother's PC and my Laptop use Thunderbird. Both continue to work.

I use Kaspersky for my AV / security but all three machines also use Kaspersky and I've no issues on two of the three.

I'm currently running TB ver 102.11.0 (64 bit).

Any assistance and clear instructions would be greatly appreciated.

Cheers

I carelessly opened an email and within seconds I had a problem with T'bird. The password vault was locked and although I had the correct password I could not get access. I deleted T'bird and the Mozilla maintenance folder, leaving Firefox in place. Reinstalled T'bird and the vault was still locked. Two a/v programs are negative. I guess there's a hidden folder somewhere that needs sorting out? I much prefer T'bird to anything else so I hope to find a solution. Thanks.

I have 3 email accounts in Thunderbird, all POP3 type via Spectrum.

I’ve been having intermittent problems with one of the accounts, namely that I can't delete some messages in the Inbox. (The Inboxes for the other 2 accounts seem to be fine.) When I try to do so I get a "Thunderbird is not responding" message and everything freezes. I have to use Task Manager to exit the program.

I went to Help >Troubleshooting and cleared the cache, disabled add-ons, etc., but no luck so far.

I would really appreciate any suggestions. If the only remedy is to uninstall and re-install TB, how do I do that?

Thanks!

In thundertbird 102.11.0 (32-bit). unread messages remain unread aftrer selecting the message. I have to opeen the message in order to mark it read. This is different from what happened beforew. just selceting the message would make it Read. This is slow as I dont always need to open messages In Settings > General, Reading and Display, Automatically mark messages as Read ius checked, and Immediately on Display

Yesterday I was answering a message on Tbird and I somehow fat-fingered - probably hit Ctrl or Alt -plus a character - in such a way that it damaged the Thunderbird settings for the e-mail account I was using (I have two). The other one is OK, but any time I receive a message on the damaged one I get a warning in yellow across the bottom of my screen that "A unique identity matching the From address was not found. (plus some more verbiage)."

I have found that if I move messages from that inbox to my other one, they then behave normally, can be responded to, etc.

What have I done and how can I fix this?

Thunderbird version 102.11.0 (64-bit) constantly hangs with no response for like 25 seconds during each instance of a delay! This has been going on now since like 6 previous versions and upgrades! Thunderbird version 102.11.0 (64-bit) running on Fedora Linux 6.2.15-200.fc37.x86_64 constantly hangs even in Troubleshooting mode? I tried re-indexing the Database to no avail? Thunderbird has been reinstalled as well so the issue must be in my Profile and/or Database? I am running in Troubleshooting Mode right now and experiencing the same behavior! Help me resolve this please! I really gets bad when I try to compose an email! I experience multiple delays as i draft an email!

I'm running Thunderbird 102.11.0 und Xubuntu 22.04 with only a single Addon installed (Owl) and it becomes unresponsive every few minutes for several minutes.

This happens on two different computers (same OS setup).

Unresponsiveness happens on arbitrary actions like switching folders, navigating settings whatever.

Both machines have at least 16 GB of RAM.

Hi I am Henk, from the Netherlands

I bought an HP Envy 360 computer in Feb last, with Windows 11 at first Thunderbird was working ok, but after an manual update app. 10 days ago Thunderbird was very slow and almost impossible to work with. After consulting HP I reinstall the orgininal settings, but the problem now still remain. Is is problem known and is there a solution? Thanks in advance.

Since most recent update, TB is "Downloading message 37278 of 14019 in inbox" Process is taking days, and slows everything down to a crawl. I cannot stop the process. What is happening and what can I do? This has never happened in previous updates. Yes, My inbox is huge, but I like it.