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For a couple of months now I have not been able to keep the email client logged into my email account. Every so often I have needed to re-enter my email password in download my emails. However, this does not happen with my email on my Apple iphone, it functions normally. Last year, I added a laptop email using Thunderbird and it also is now having this issue starting about the same time as my desktop. I did not have any issues with my email until several weeks ago and it happens on both computers. I asked here what to check, and followed the instructions given here, still no change. In fact, on my desktop, it no longer will download any emails, no matter how many times I enter my password.

I use the desktop for my regular email use, with the laptop used for when I travel. The iPhone is mostly as notification of emails so I can answer on my desktop.

Let me repeat, everything has worked well and without issues until a few weeks ago. I made no changes in my settings prior to that, no changes to my internet provider, no other changes than normal software updates to Thunderbird.

Thank you for your past guidance and for future help.

I sent an email to myself and got: Sending of the message failed. An error occurred while sending mail. The mail server responded: RCPT TO:<[email removed]@bell.net> User unknown. Please check the message recipient "[email removed]@bell.net" and try again.

How can I fix this?

Hi. For a long time, I've noticed that emails I send from home are sent, but those I try to send with the same settings do not get sent when connected to the Internet in 4 out of 4 cafes. My ISP, Zen, hasn't been able to explain why. I've tested whether Google VPN blocks it somehow, and it doesn't. I normally use Thunderbird. Today, I found that, in the same cafe, messages I tried to send using Thunderbird failed to send, whereas there was no problem with GMail, Proton Mail or Outlook. Any suggestions?

I am a long-time user of Thunderbird and have relied on the calendar application extensively. I recently had to purchase a new computer and had to install updated software for everything including Thunderbird. The calendar is giving me fits... When the computer is turned off, I lose all records of previous meetings as well as all scheduled meetings in the future (as well as any scheduled recurring meetings) along with the links to the online meetings. I assume that I have a problem in my settings but I don't know where to begin... I have looked for other similar problems on line and most seem to be associated with sync-ing with other calendar applications - but I don' use other calendar applications and don't sync with any other applications.

Any help would be greatly appreciated.

My gmail account has two Sent folders.

1) A folder Sent in TB. Its location in properties is (host)@imap.gmail.com/Sent. But its contents correspond to the gmail account's label [imap]/Sent.

2) Another folder Sent Mail in TB. Its location in properties is (host)@imap.gmail.com/[Gmail]/Sent Mail. But its contents correspond to the gmail account's System label Sent.

So gmail's sent mail appears in #2 - TB's Sent Mail folder - and TB's filters that run after sending mail don't run on it.

How can I straighten this out? Just swap the locations in the two folders' properties? That will make them incorrect but maybe make it sync correctly.

(background)

I'm still running Windows 7 (it works for me) and Thunderbird (version 115.16.2 (32-bit)) has been my e-mail client application for many years.

Inside Thunderbird I have a series of sub-folders (which I shall refer to as 'folders') named & arranged by years & months.

Any received e-mails that are 'personal' (i.e. not news items, previously OK'd advertising, or junk) get filed into the current month's folder (which is 'inside' the current year's folder). (Towards the end of a current month I create the next month's folder.)

I used a wired USB mouse with two buttons ('left' & 'right').

When things are working like they are supposed to (and I have received a piece of personal e-mail that I want to store) I 'left click' on the e-mail (in the 'inbox') and (while holding the 'left button') 'move' the e-mail into the current month's folder.

(the 'problem') Once in awhile I accidentally click the 'right button' during the process of moving an e-mail from the 'inbox' to the current month's folder.

To-all-appearances the e-mail 'disappears' though a few times I have found it in an 'adjacent' month's folder (I also look in the 'trash' folder').

So far my only 'solution' (I at least have a copy of the message) is to go to my e-mail server (I have it configured so that it does not automatically delete messages) and 'forward' the message to myself (in which case I am shown as being the 'sender' when the message arrives in the Thunderbird 'inbox').

(my question) Does Thunderbird have an (undocumented ?) 'disintegrate' action ... where a message can be completely erased as a result of an accidental right mouse button click ... or is there some other folder where I should look (other than 'adjacent' month's folders and the 'trash' folder) ?

(signed) Paul in Texas

I converted to Thunderbird 128,11.1esr in May 2025. My address book did not migrate to the newer version and I don't have the old one. Also, I don't know how to return to the previous version of Thunderbird.

Gmail is connected. Deleted letters in the trash have stopped loading. I haven't changed the settings. I just went in today, the folder is empty. If you go directly to Gmail, all the letters are displayed.

 Сведения о приложении

   Имя: Thunderbird
   Версия: 128.11.1esr
   ID сборки: 20250611182504
   ID дистрибутива:
   User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:128.0) Gecko/20100101 Thunderbird/128.11.1
   ОС: Linux 6.14.11-300.fc42.x86_64 #1 SMP PREEMPT_DYNAMIC Tue Jun 10 16:24:16 UTC 2025
   Тема ОС: Adwaita / Adwaita

23 June 2025

I'm still unable to fix ongoing e-mail Download into my Thunderbird from my yahoo.com acc on My Desktop or Laptop. I've re-set Password on both Yahoo & Thunderbird ...

On checking my Thunderbird e-mail I get these error messages:

Mozilla Thunderbird ESR Authentication failure while connecting to server pop.mail.yahoo.com

Mozilla Thunderbird ESR Thunderbird Connection to server pop.mail.yahoo.com timed out

I've had Thunderbird for well over 10 yrs in US & now in the UK, no problem. The only recent changes I've done is to change my Yahoo.com Password & updated it on Thunderbird. Once that was done Thunderbird failed to download my messages to my Inbox.

twj

Hi there,

I've recently had a problem with a couple of client PCs where their Thunderbird profile folder has grown to fill the entire hard drive. In both cases, the relevant account folder in the profile's ImapMail dir had grown to over 300Gb. This account takes up 45Gb on the server (where I'm running Dovecot with maildir storage). In another case on both PCs, an 18Gb account had grown to over 90Gb.

Both client PCs are running up-to-date Thunderbird (139.0.2 64bit), one under Windows 10 and one under Windows 11. Both had auto-compact set, with the minimum saving reduced to 100Mb. Both problematic accounts are shared accounts that use a deeply-nested folder structure. In both cases, I was forced to delete and then recreate the these accounts in Thunderbird.

I'm an experienced sysadmin who is also running the mail server, so I am able to provide any extra info needed. Additionally, I accept that these are large email accounts; I'm in the process of setting up an email archive system for the client using Piler. I have read many other reports of outsize Thunderbird data folders; these are usually referring to less than 20Gb. The problems we're having seem to be an order of magnitude larger!

Thanks in advance, P.

I have several email accounts. One of these has a calendar linked to Google. I use this for calendar invitations from any of my accounts. However, I need to be able to send calendar invitations from the non-linked account like you can in Outlook. There, each time you add contacts to an invitation, you get an option to send From: Does Thunderbird have this capability? BTW I am not talking about setting default account. I need to be able to select when I create an invitation.