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My husbands email account appears to be corrupted. He can't send or receive messages and is asked for a password which is always rejected. The provider, Plusnet, have checked out their end and say all is well and hacking is unlikely. Webmail works, we have changed the password, but still no access to Thunderbird. The same problem exists on his other devices that use the same email address but do not use the same platform. Any ideas would be really welcome. Thank you, Barbara

I have added my calendar to Thunderbird and it is syncing with Google but when I add a new event it only allows me to set one notification time. I have a standard notification of 30 minutes before something happens and in Google I can add additional notifications like a day before or a week before. I don't see that I can do that when I create the event in Thunderbird. Need to create all of my calendar events in my Google calendar?

My Inbox showed no messages the last time I started Thunderbird (until Thunderbird started to download new messages). I looked on the C: drive under Profiles, and the Inbox showed 0 KB, when a backup from 10/17/2021, was 1.67 GB (1,753,217 KB). I am not sure how this happened. I think there were Thunderbird updates for a couple of days before I noticed the problem. I had been having trouble with Windows 10 updates, and saved files on an external hard drive on 4/20/25 to back them up, but by then, the Inbox file in my Thunderbird profile showed 0 KB. I am using POP to download emails. Is there any way I can get my emails back? Are they saved somewhere else? Thank you in advance for your help!

Thunderbird shows that there are 22 messages in the spam folder, but it does not display the individual emails. I would like to be able to see them. The same issue occurs with the "Junk" and "Trash" folders, or sometimes the number of emails shown does not match the number actually visible. Thank you!

I'm using the latest update of Thunderbird on a Windows 11 machine. This issue has been present since I started using TB sometime last year, so through various updates.

I set most of my folders, especially those used regularly (inbox, sent, trash, etc.) to unthreaded, which does sort the messages unthreaded. (Some folders I use so infrequently I haven't bothered to change them)

However, in many cases (mostly excluding the inbox), the folder reverts to threaded and I have to do it all over again.

Not the end of the world, but aggravating.

In an ideal world, I'd set ALL of my folders to unthreaded and probably leave them all there forever. (Although the option to switch on the fly does seem nice and conceivably, I might use it). Reading previous threads, I'm assuming that this needs to be done folder by folder. But what I have NOT seen is why folders which have been changed revert to threaded. I haven't figured out any pattern to it; reversions don't happen every time, so they appear to be rather random.

P.S. I have 2 email accounts and at various times, I've had to delete and re-install both of them. For one, it happens with some frequency, for the other, much less so. But I'm pretty certain that there is no correlation between the problem described and reloading the accounts. And I'm also pretty certain that it occurs from time to time in folders which store emails which are independent of either account and not online.

Attachment displays size unknown. I am unable to save, download or open. Most of the online fixes suggest searching for mime under config editor. This does not seem to exist in this version. Using windows 11, TB 137.0.2

I believe I have noticed a change in the operation of Calendar Event notifications, following recent updates to Thunderbird, in the past week or more. I am currently on release 137.0.2 (64-bit) running on a Linux Desktop. This computer gets shut down every night, and rebooted the following morning. When a calendar reminder has been snoozed, and the snooze time expires when the computer is not running, and Thunderbird is not running, those calendar reminders used to show up the next time Thunderbird was started after the computer was rebooted, even if the calendar event time had already passed. In the last week or so, following recent updates, I believe this is no longer happening.

Also, I believe that calendar events that have reminders set, that have not been snoozed, whose reminder time happens when the computer is shut down, are also not being shown reminders the next time the computer is started, if the reminder time happened when Thunderbird was not running. This is also a change from the way it used to work. For example, if an event is marked as starting at 10:00 AM, with a reminder set for 2 hours before (which would be 8 AM), and the computer is booted and Thunderbird is started at 8:30 AM, that reminder no longer happens. That is a change from the way it used to work. A few weeks ago, in that scenario, the reminder would have been shown the next time Thunderbird started up.

A jpg atttachment no longer opens with right click. I have looked at settings, in files and attachments and have tried, open with photoshop elements, open with firefox, always ask, and save file. None make any difference. I can right click on the attachment and the menu says open, save etc. click on open and nothing happens.

Hi, I used a text sig for ages in Thunderbird and it worked ok. I now have one with some images that I have saved as a sig file that I made in Thunderbird and when I choose to use it, then it works fine. problem is whenever I close TB and re-open it then its gone back to using the old text sig and I have to set it up each time to use the new sig file?

Is there anyway I can fix this, its driving me crazy....

Many thanks

I created a 2nd account years ago and it has worked since then. Now when I create a third account, it works well but when I disconnect I loose the account and have to recreate it again. How come?

Hello. I have windows 11 64 bit and thunderbird on my computer. For the last month I have not been able to send pictures pasted in emails. If I attach pictures it works fine. I have tried reinstalling Thunderbird, running the troubleshooter and searching everywhere on google but I can't find anyone with the same error. Do you have any tips on anything? Best regards Håkan Magnusson

A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed:

 andrew.krischock@outlook.com
   host outlook-com.olc.protection.outlook.com [52.101.40.5]
   SMTP error from remote mail server after pipelined sending data block:
   550 5.7.1 Unfortunately, messages from [103.150.252.1] weren't sent. Please contact your Internet service provider since part of their network is on our block list (S3150). You can also refer your provider to http://mail.live.com/mail/troubleshooting.asp[truncated]

Many have posted about threads What we want is to eliminate threads altogether. They are not helpful, but are extremely annoying I want to be able to tell thunderbird No Threads Ever!!!!

Messages from some of the folders in Local Folders disappeared for no reason at all. The folder file and the .msf file though are not empty and if you edit them with a text editor you can see the messages. Also in the folder properties although the number of messages is 0 the folder size in not empty. Any ideas?

Sending of the message failed. The message could not be sent because connecting to Outgoing server (SMTP) smtp.aol.com failed. The server may be unavailable or is refusing SMTP connections. Please verify that your Outgoing server (SMTP) settings are correct and try again. I have tried over and over and get this same message.

While attempting to email, my outgoing emails fail to send, and I get the following notice: send failed due to unable to connect to outgoing server. The server may be unavailable or refusing to accept SMTP connections. How may this issue be fixed?