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After tried many suggested steps to trouble shooting the problems, it still can't download Comcast emails. It keeps pop up "enter password" or "password failed" again and again. But I can send emails. I can't upload the trouble shooting information file to send. Thanks

Every so often I get an error message "Your message was sent but a copy was not placed in your sent folder (Sent) due to network or file access errors." I understand these if I am sending multiple large attachments as I am using Imap and the Sent folder is on the server. But I got it today with a simple pdf attachment. Is there anything I can do to alleviate this problem ?

Edition Windows 10 Home Version 22H2 Installed on 6/26/2024 OS Build 19045.6466

Thunderbird 140.10.1esr (64-bit)

OK, so I see where others Thunderbird users have previously asked about why e-mails are disappearing from their Thunderbird junk folder but have a quite different problem. So, when I go to my junk folder momentarily all the mails are present, but then right before my eyes 2 or 3 just simply disappear! They truly disappear and are nowhere in any folder on Thunderbird account -trash, archives, sent, etc. I did the obvious and Googled and there are some informative posts about Thunderbird settings for time-outs and filters and automatic deletion - BUT, BIG BUT all my settings conform already to all their suggestions on these various web posts. So at my wits end I ask the folks in the community if they have any explanation as to why e-mails in junk folder on Thunderbird literally just disappear in front of me. I would be greatly appreciative of any suggestions.

Hi,

I use the quick filter option very often. I use this to filter my message list by sender I'm a bit "tired" of constantly copying the sender e-mail address -> then pasting it into the quick filter field.

I am looking for an option like "Quick filter by this sender" or something like that Does anyone know how i can achieve this?

Some years ago there was an excellent extension from trusted contributor alta8888 called TotalQuickFilter (https://bitbucket.org/alta8888/totalquickfilter/wiki/Home) but unfortunately it was discontinued

I have a Postfix/Dovecot server that hosts 10 of my domains from one IP.

When you open Thunderbird, it checks the domains you have preset. I have two. This happens immediately, especially if there is no new mail on the server. Everything works fine.

If you have other domain mailboxes open, and I have eight more, and you click the inbox on each one, Thunderbird stalls at the fifth mailbox, regardless of the inboxes' selected order.

tail -f /var/log/mail.log - confirms this.

I have reset or modified everything I can think of. My server is not throttling Dovecot.

This must be something internal to Thunderbird, possibly related to only using a specific mail server IP for all domains.

Google AI suggests assigning a unique local IP alias to each domain on my server so Thunderbird thinks it’s talking to 10 different machines. This seems extreme.

Any solutions?

I have Thunderbird on another PC that shows the incoming emails with the contents with the contents displayed under the email list, yet on my new PC I cannot seem to get that setting. I have to double click an email and it opens a new tab. I have used your help and also YouTube to no avail.

Every time I launch Thunderbird Beta 151.0b1 on Arch Linux, I immediately get a notification saying "The certificate for imap.gmail.com does not come from a trusted source." If I click through to the exception dialog, it shows "No Information Available / Unable to obtain identification status for this site" — it can't even fetch the certificate to show me what's wrong with it. The error only appears on launch and doesn't come back. Mail sends and receives fine.

From the terminal, openssl connects to imap.gmail.com:993 without any issue (Verify return code: 0, TLS 1.3, X25519MLKEM768). No antivirus, no VPN, no TLS-intercepting software. NSS 3.123.

Has anyone else seen this? Is this a known Beta issue?

I've tried setting up Thunderbird archiving according to the documentation to save archived messages locally, and in the same hierarchy they had when I archived them. That is, if I have:

INBOX

   Box1
   Box2

... etc. then archiving would create a parallel structure in Local Folders

However, this isn't working.

I select "Keep message archives in Other (Archives on Local Folders).

For "Archive Options" I select "A single folder", "Keep existing folder structure of archived messages" and "Recreate inbox folder".

However, when I archive something, Thunderbird just creates a folder "2026" (this year) and puts the message in there.

Why are my settings NOT working?

- Tim

Since yesterday (27 Apr 2026) any and all mail that comes into Thunderbird gets marked as SPAM. I searched online and found people saying that I could reset the junk training filter, so I did this, but incoming mail was still marked as spam. The next suggestion was to delete the training.dat file. Did that, restarted Thunderbird and incoming messages are still marked as spam. The last suggestion was to turn off adaptive junk mail controls. Didn't want to do that because I assumed that it would let spam through. Nope. Turned it off, restarted Thunderbird and two emails from my work came in and got flagged.

I'm running version 140.10.0esr (64-bit) on Windows 11. I am using IMAP to connect to the mail server but it's not running any spam detection software (like Spamassassin). I know this because it's my server and even if it was, no updates have been preformed since the first of this month and this just started happening yesterday. Combine this with the bug that Thunderbird notifies me of incoming mail, even if it's spam (didn't post about this because there are plenty going back a couple of years), is starting to make me look for an alternative.

After the last update when trying to send email I get the warrning of app: errer with "smtp.gmail.com". Any idea on how to fix it? Thank you for your help.

I have a SoGO email account through my educational institution. I configured the new account in Thunderbird just as I did with my other email accounts (which are all functioning well). My SoGO email was verified to be working, and I was able to receive new emails and also search my old emails. However, when I try to send emails, I come up with a Send Message Error that says Authentication required. I have checked the email address, the Outgoing Server, the authentication methods, and the server settings, and I can find nothing that is wrong. I am still able to send emails from the other accounts, and I am able to get incoming emails to the SoGO account, I just can't send them.

Hi, I' ve been using Thunderbird for years with no problems, but the other day my servier changed their settings and now Thunderbird won't recieve any of e-mails. They sent me settings and finally I figured out them to work on my phone, but not on Thunderbird. The new serivcers address is "ny201.whpservers.com" and the incoming port is 995 and the outgoing port is 465. I used the same settings that I used for my phone, but they won't work on Thunderbird. I'm supose to use SSL for incoming/outgoing messages and when I use testing connection to server I get a message of "The certificate for mail.dostie.net:995 is not valid for that server. Someone could be trying to impersonate the server and you should not continue." Can you please provide help to resolve this issue.

Thank you Donald Dostie

The attached message pops up when in coming mail is coming in, not anything gong out. How can I fix this. See attached image. I have checked my sent messages..nothing shows up..I have checked my out box in local folders still nothing shows up

I lost my windows 11 computer, and need to restore all my missing Local folders in my new computer that I have just installed Thunderbird. I think I need to delete everything under c:\user\myname\appdata\Roaming\Thunderbird\*. Tried this and still no Local stored emails found when I brought up Thunderbird? I have years of data stored there and really need them.

Dear Team, I have to download approximately 9000 emails in the inbox/ sent folders saved in yahoo with attachments. Though I could download after spending a week, unable to see the downloaded messages. Please inform how to proceed. Thanks. p.s: As suggested by chatgpt, I selected all messages in both the folders and downloaded them again. Please suggest best way to download the messages quickly and verify the contents. Thanks for your help. -Mani