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Hi, I'm unable to send emails or reply to emails. I keep getting a window pop up that says 'Add Security Exception' Then after I close that the following message comes up

Sending of message failed Unable to communicate securely with peer requested domain name does not match the server's certificate The configuration related to must be corrected.

I have no idea what all this means. It's only just started happening since I did a Thunderbird upgrade. I hope you are able to help me please? My apologies but I'm unable to attach screenshot pictures. Thank you for your time. Kind Regards Jen

Can I expand my storage space above 10 Gigabytes (and if so, HOW?) Or can I delete emails to free up space. I have been archiving my older emails about every 3 months but that has not helped with the storage space issue. The only email that I have that is still working is DrLeeCowden@gmail.com. Thank you.

Did a reinstall of win11, which wiped out my old files-- re-downloaded latest Tbird, but can't get it to sync up and download my archived emails-- What am I doing wrong, and how do I get it to work? Sledgehammer is looking better and better.......

I'm unable to send email from my mobile device. I used the QR code method to transfer my email account information from the desktop Thunderbird, to my mobile app. I am able to send & receive email via desktop version.

I've confirmed the SMTP and password information is correct. I've uninstalled and reinstalled the app. I've selected "none" regarding password for outgoing mail.

Error via mobile device: "Failed to send some messages" "Client host rejected: Access denied"

I copied a TB profile when backing up some years ago (I know this isn't the correct method). I need to open the "Sent" mail file in the profile. This file is listed as "file" under "Type." What program do I use to open this file?

How it's possible to create a signature with a logo or image? I had success on creating a text signature, but I wasn't able to add an image. Thanks for your support.

Thunderbird implements the "n" next and "p" previous keyboard shortcuts in the message list view. Super useful shortcuts!

However they have now changed and become very user unfriendly.

Hitting 'n' moves the selected message down to the next message. If you are halfway down the list then it simply selects the next message. No auto-scroll happens.

However if you hit 'p' for some reason the whole view scrolls and aligns the selected message as the top message in the view. This is super unwelcome and jarring to the user. It should only scroll if you are already at the top and hit 'p' again.

The fact that 'n' and 'p' are inconsistent makes me think this was not intened behaviour. Can the 'p' behaviour be reverted back to 'no scroll'?

The problem with standard email storage methods is that they don't scale well. Mbox, the default in Thunderbird, creates large files, and if you backup changed files, every backup requires recopying a multi-gigabyte file, because it has changed when even one message was added or deleted. Maildir, the alternative, puts each message in a separate file. But file systems have a lot of overhead and their own limits. When you have hundreds of thousands of messages, especially on a PC, that clutters the computer's file system, and between the file cluster size and directory overhead, it wastes a lot of space and slows down other operations. Two bad options. And let's not be too snarky about what that company from Redmond does in its awful mail system, with a giant proprietary mail database file that sometimes gets corrupted...

It is obviously a lot to ask to create a new mail file format that scales better. It would not be standard and could break some things anyway, though in the long run it might be a good idea. But I have an idea that might work for Thunderbird. As it stands now, it is possible to create archive files by month or year. Then new mail doesn't require those to be re-copied. WHAT IF a "virtual mailbox" could be created that, instead of consisting of one Mbox file or one maildir directory, consisted of a set of Mbox files treated by the UI as one? Quick Filter would filter them all as one, unlike with archives, and you could scroll through them all and sort them and see threads, but they'd be stored as monthly or annual (or whatever) files, the way archives are. Sending and receiving would be unchanged, using the current folders, but periodically the folder could have the oldest ones moved out and still made part of a virtual folder.

There are some modest virtual folder capabilities now, but I don't see how to do this. Does it seem like a possibility with what's there, or a modest enhancement, or is that the kind of thing that would be a huge effort?

Just wondering if there was a way to change the behavior of Thunderbird. Currently, if I add a subfolder to an IMAP mail account, that folder will show up in the Unified Inbox. Yes, I know how to remove it from there but I'm getting tired of doing that each time I add a folder as I need to do it to multiple devices.

Thanks.

I have two problems with labels after changing computer. The first is that by entering the names of the labels, they are put in alphabetical order and not in the previous one. After years of use, it’s quite annoying...

The second is that in the grouping of messages by labels, they are doubled. Instead in the Inbox folder no. And this is more serious.

MacBook Pro M4 Pro, macOS 15.2 Thunderbird 128.6.0esr (64 bit)

Ho due problemi con le etichette dopo aver cambiato computer. Il primo è che inserendo i nomi delle etichette, queste vengono messe in ordine alfabetico e non in quello precedente. Dopo anni di utilizzo la cosa è piuttosto scocciante...

Il secondo è che nel raggruppamento dei messaggi per etichette, questi vengono raddoppiati. Invece nella cartella Posta in Arrivo no. E questo è più grave.

Delete used to not work as TB seemed to be forever 'compacting', now appears resolved.

THREADS, the display tacks a new email onto a recent thread-related or not. I did not ask for this and would like to remove it. Seems that since the People behind TB have now left us to the 'community' We are not impressed.

ALAN x@xx.org.uk [address edited for privacy]

Using windows 7 and have been using TB for well over 20 yrs. but very disappointing recently.

Is there any way to open just one particular message that is in the Thunderbird inbox as plain text, without changing the setting for all messages?

I've read solutions that say to: Go to the "View" menu at the top of the Thunderbird window; Choose "Message Body As" > "Plain Text".

If I follow those instructions, then all subsequent messages that I open are also displayed as plain text, until I change that option back. That's not the solution I'm hoping for.

I've also read that I can right-click a message in the inbox ... Select "View" from the context menu; Choose "Message Body As" > "Plain Text".

but I have no "View" option in the context menu.

When I get a message from a sender which I suspect might be a scam, it would be very helpful from a security standpoint to be able to easily open just that one suspicious message as plain text.

Is there any way to do this? I've also looked for an add-on which might enable me to do this, but couldn't find one.

Any suggestions appreciated, thanks!