Thunderbird Community Forum

My eMail has worked fine for many years - until this morning.

 When I first tried to "get messages", I got a response, "connection to inbound.att.net server reset".
 I restarted Thunderbird, and then the computer (Windows 11), and when I tried again, I got, ""inbound.att.net (POP) .. certificate revoked".
 I can login to my ATT webmail, but I can't download eMail to my computer via Thunderbird.

... In my attempt to upload this question, I looked for the TB Version, but it said to update Thunderbird. I did so, not it is back to telling me "connection...reset"

 Please help!

AVG sends message: "We've identified a site certificate problem" "Trust for this certificate has been revoked."

Looking at certificate page that AVG provides is Greek to me. General tab displays:

"This certificate has been revoked by its certification authority"

issued to : inbound.att.net

issued by: Digicert Global G2 TLS RSA SHA256 20250 CA1

Valid from: 4/12/26 to 10/28/26

Details tab:

lists a bunch of things that I don't comprehend and offers an option to "copy to file" and lists a number of formats to copy the file to.  Have no idea which would be the one to use. 

Trying to access email directly from browser has not been successful because it wants verify my identity by sending message to my phone, but it does not send anything.

As per title, if I have a large enough distn list I get a warning bar (see image) with The x recipients in To and Cc will see each other's address. You can avoid disclosing by using Bcc instead. Then two options, which appears to require a response. ( I haven't tested not acknowledging it and sending a blank email to one of my large lists as I don't want to appear incompetent to all my work colleagues)

This helpful warning is (emotively) treating me like an idiot. I am well aware of the 3 categories and I know how to use them. I don't need to be told each time and have to choose. I don't need a warning, if I stuff up that's my problem.

The issue for me is that recently I have started to use some larger distn lists so it's occurring too frequently.

Have searched but so far missed any option or config setting to disable this. Can anyone please advise how to do so, if it is possible.

This isn't asking for a debate on whether or not it's a good idea to warn people who don't understand email sending options (you can guess my view but each to their own). I'm simply asking is there a way to turn this behaviour off and stop TB from wasting my time requiring a response.

Thanks.

I have no accounts, no old emails, nothing.

Version 153.4.0esr | Released September 30, 2026

Update History The following updates have been installed Thunderbird 153.4.Oesr (20260929234349) Installed on: October 5, 2026 at 6:23:30 AM Status: The Update was successfully installed Thunderbird 153.3. lesr (20260917204311) Installed on: September 18, 2026 at 3:24:29 PM Status: The Update was successfully installed

Old tower PC Edition Windows 10 Home Version 22H2 Installed on 11/12/2020 OS Build 19045.7725

Gateway Processor Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz 3.40 GHz Installed RAM 16.0 GB (15.8 GB usable) Storage 4 GB HDD ST4000NC001, 932 GB HDD ST1000DM003-9YN162, 1.82 TB HDD Hitachi HUA722020ALA331, 117 GB SSD SanDisk SDSSDP128G, 7.28 TB HDD ST8000DM004-2CX188 Graphics Card Intel(R) HD Graphics 4000 (96 MB) Device ID C6B6F480-ED70-4787-A153-1FD620BAFDA9 Product ID 00326-10000-00000-AA675 System Type 64-bit operating system, x64-based processor Pen and touch No pen or touch input is available for this display

It's very odd. Normally moving an email, say from the Inbox to the relevant year's archive, takes "no time at all".

Which is true for all the mailboxes shown on the attached screenshot, EXCEPT for the four at the bottom. Moving even one message from Inbox to Yiddish can take ten seconds or longer (with the dreaded "Not Responding" occasionally). Moving something in the opposite direction is also screwy, only from those four.

I had thought that it was because they're rather large. This first started when there were just Yiddish and MSW, and I split off most of the earlier years into the archives shown. To no avail.

It's only an annoyance, but I'm puzzled about how such a thing could happen.

Also very slow tagging or untagging a message just in those mailboxes.

Moderator Notes:

• need a performance profile https://support.mozilla.org/en-US/kb/profiling-thunderbird-performance

When writing an email and i try to press attach button, nothing happens and i cant attach file that way. Drag and drop works. This came after updating thunderbird to latest versio 157, earlier attach button worked fine. Any solutions to this problem?

In Thunderbird, the “attach” button stopped working when sending a message, although the “drag and drop” feature still works. Could you suggest what the problem might be?

I have been trying to find an help email address for Thunderbird, as my copy has changed the layout of my screen and dropped the email display window that normally displays the email I select BELOW the email list in a SPLIT SCREEN mode.

I have lost mt SEND button when I want to send emails to others. This has resulted some time ago and is most inconvenient when replying to email's. How do I get it back?

I use Thunderbird on multiple computers, sharing an NAS. One is Windows 10, one is Linux Mint. Both have Thunderbird 153.3.1esr installed. The email Profile and email file storage is on the NAS. The "home" folders on both machines have a profile.ini file that points to that shared profile. This worked fine for many years.

For perhaps 6 months i've only accessed email from Windows. Now i'm trying again to access from LinuxMint. It no longer works.

From Linux, at startup, Thunderbird complains that i'm trying to open my profile from "an older version of Thunderbird". A popup dialog claims "A newer version of Thunderbird may have made changes to your profile which are no longer compatible with this older version. " It offers to create a new profile.

First, the same version last edited the profile as is reading it. Second, i don't want to create a new profile, as the existing one has multiple email accounts at multiple domains, with multiple sigatures, and custom storage paths, etc. I tried profile manager, but it just takes me back to this dialog.

How do i get Thunderbird to use my existing shared email storage ?

i'm using thunderbird for my email messaging. when i reply to an email, why doesn't it show up in the inbox along with received email i replied to? it is nice to see the whole thread at once.

Suddenly I can't attach images (or anything) to outgoing emails. I do this a lot and it worked fine all day yesterday, then stopped in the evening. When I click the Attach button, nothing happens. I've deleted 1000s of emails and compacted the folders, nada. My Thunderbird is up to date v153.4 on Win 10. Any ideas? Thanks, Andy.

I am requesting that the update team consider providing an option for larger and permanent scroll bars. The current small, disappearing scroll bars require more accurate placement of the cursor than is easy and sometimes results in false signals to Thunderbird to scroll as you try to center the cursor. I know I spend several seconds messing with it each time I want to scroll up or down or just go to the next line as I'm reading. This may be a request to accommodate the elder community, who often has less fine motor control in their hands.

Hi community,

I want to have the same font and font-size in:

• my HTML message body text
• my signature.html file

so I can send consistent and nice-looking e-mails, like you would expect.

Here are my current settings:

• Settings > General > Language & Fonts > Fonts >
  • Default font: Arial
  • Size: 12
  • Advanced: For both "Latin" and "Other Writing Systems" I have the settings you can see in the attached screenshots.

I heard that these settings are for personal viewing.

• Settings > Composition > HTML Style >
  • Font: Arial
  • Size: Medium

I heard that these settings are for viewing by recipients.

The first line of my signature.html file looks like this: div style="font-family: 'Arial'; color: #222; line-height: 1.0; font-size: 14px;"

There is always a slight font size mismatch of the message text with my signature.

I unsuccesfully tried tweaking the html font size values in px or pt to match the given size in Settings > Composition > HTML Style for Medium or Large.

It seems that the available font size granularity of Medium or Large just does not match corresponding pixel or point values?

I would be extremely grateful if someone can guide me on how to achieve this!

If there is no valid solution for this problem, I'm happy to open/report an issue on this.

Thank you and have a wonderful day

Enclosed are jpg copies of the current sets of filters failures in my TB email program.

TB Error0 shows the 6 emails that have arrived and are placed in the INBOX. However, each of these has a corresponding filter set up to move them upon arrival to a separate subject email mailbox.

Note: If I highlight the INBOX and then go to Tools > Run Filters On Folder ... all of these INBOX email messages will be correctly filtered and moved to their respective email mailbox, BUT each of them is shown as having been "read" and unless you pay close attention, you may not know where these INBOX emails were sent.

I am also enclosing TB Error1 & 2 that show the last couple of days message filtering errors.

I can find nothing wrong with how each of these filters are set up, yet they seem to consistently fail to operate when new emails arrive.

Note one of them is for incoming emails from ... schiffsovereign.com. I have edited this filter repeatedly, even deleted it and re-input the information. Yet the filter never takes hold and does what it is designed to do. I am enclosing a jpg of that specific filter as TB Error3

I am looking for suggestions on how to fix this problem.

Thank you and best wishes,

/s/ James T Saint, CCIM COO