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Thunderbird stopped downloading email in July 2026 on the same day an update was pushed. The problem showed up after an update to TB on 27 July 2026. The weird thing is that we have another account and it has no problem with that TB account downloading. I even moved the profile to another laptop. Yesterday it downloaded 25 of approximately 300 messages and stopped. I had a lengthy tech support call with Yahoo and they concluded the problem was Thunderbird. I've re-installed and updated the program. I've gone through multiple App passwords in an attempt to re-connect. The outgoing mail works. The web based Yahoo mail works. It's not an antivirus or firewall problem. I even archived most of the Yahoo mail from the web and tried to see if I could download messages if there were fewer of them. Even 10 or less would not download.

We have it set up as a POP3 account. The hard drive on the laptop in question has only 10% of its capacity filled. I accidentally removed the other account and had to set it up again yesterday using the exact same steps and it works without issues.
 Does anyone have any suggestions as to what I might try next?

Since about November 2025, all the mails I try to sent to @sfr.fr addresses (different recipients) fail and I get the following message: Sending of the message failed. An error occurred while sending mail. The mail server responded: <xxx.xxxx@sfr.fr> recipient domain rejected (blacklisted by local policy).

Please check the message recipient "xxx.xxxx@sfr.fr" and try again

I did not have this problem before. If I use Greenby's web mail (My email provider ), the messages are sent without any problem. I would very much appreciate some help to solve this problem! P.Y: pemy@pemyoung.plus.com

In the last month or 2, when I delete an email it does not show in the trash folder. I can wait from 5 minutes to even the next time I reboot my puter to finally see it it trash. Sometimes it sends it to the all mail or important folder instead of trash. And if I delete from there, it still takes tons of time to end up in the trash folder...if it even gets there. This seems to be getting worse by the day. I have clicked repair folder, no change, I have cleared Thunderbird's cache, no change. It's also now taking way too much time to load an email that contains a picture. This happens with at least 3 of these gmails. I'm at a loss here and extremely frustrated and about to change these gmails from imap to pop. win10 and TB is up to date. But it doesn't compact folders as much as it used to either. Any help appreciated

I have upgraded to TB153.0.3ESR. I've been on the ESR stream for a long time now. But recently, I started having trouble with my google calendar appearing. I've deleted the provider plugin, I've moved to OAuth2, and for the most part, calendars that I have that are read-only from google show up all the time. But my personal read/write google calendar will not show up.

If I go in and delete the cache.sqlite file, and then start Thunderbird, my entries show up. However, if I switch to a different week, my read-only calendars still show up, but my personal calendar goes away.

I've tried everything listed in all of the steps to fix this, but I can't find anything that gives a clue as to what is happening. Anyone else see this?

Steve.

Sometime ago, when I was regularly using more than one computer, I thought I'd found a way to have my Thunderbird address book centrally located and accessible from both computers. I got no success from attempting this, but have suffered some side-effects every since. Configuring Thunderbird back then somehow involved using the location "demo.sogo.nu" and I believe it related to a security certificate. What used to happen was, soon after rebooting the computer, I'd get a couple of pop-up messages about connecting to demo.sogo.nu that I could clear away easily. Recently, something changed regarding this certificate and I now get pop-ups (screenshot attached) that continually bother me to create a security exception. I want these gone! I've gone into the Certificate Manager and can't find anything under the Server tab to delete. One other clue is a second screenshot that I discovered somewhere in Thunderbird that actually shows the *.sogo.nu certificate - but offers no way to delete it! Can anyone give me a hand? My only alternative is to literally annihilate Thunderbird and start from scratch, but I really don't want to go there.

How do I configure my thunderbird client to send e mail using my gmail account. Gmail's "solutions" do not seem to work - see attached for what they claim. I have used both ports 465 and 587 and the appropriate connection security.

Hi, Need help with maps that cannot be removed. Thunderbird downloaded my map configuration, after a new Thunderbird installation, from my online account/my internet provider which was OK. After that I removed all maps on my online account but the maps in Thunderbird is still there but out grayed and I cannot delete them?

I uninstalled Thunderbird and also removed Thunderbird associated maps under %AppData% and %LocalAppData% but when I do a new clean installation same maps shows up in Thunderbird again? I waited some days and did a new installation again, but same issue. I have also deleted everything in W11 cash memory.

Attached picture shows the out grayed "NyMapp and subfolders" I cannot delete. How do I get rid of those folders?

Any help is appreciated.

Hi, Hoping I can get some help here, I couldn't find an answer in the search topics.

I have lost a few local subfolders. First the subfolders lost the emails contained in them and then the subfolders themselves disappeared.

I renamed the main folder just removing the year from the folder name and not long after that the above happened.

I have tried the following:

• Searching the help topics • Searching the forum • Closing reopening Thunderbird • I removed .msf files and restarted Thunderbird

I am not sure what I can do now.

Thanks in advance for any help.

my new message page doesn't now have a box -top left -to restore edited/ corrected lines of script. When editing wholelines of script, even whole lines have diappeared. and couldn't be found, and not in draft. Advice would be very welcome. Thanks. Mike

Hello,

I am having an issue with Thunderbird automatically marking new emails as read.

When a new email arrives, it initially appears as unread in Thunderbird, but after a short time it automatically changes to read, even though I have not opened or clicked on the email.

I use Thunderbird on two computers – a desktop computer at the office and a laptop when working from home. The problem started after I installed and configured Thunderbird with the same email account on my laptop.

I have already disabled the “Automatically mark messages as read” option in Thunderbird. I have also repaired/reindexed the Inbox folder, but the problem remains.

The email account is configured using IMAP on the laptop.

An important detail: when I check the same emails in Gmail through a web browser, they are still marked as Unread. Only Thunderbird shows them as Read.

Could using the same email account in Thunderbird on two different computers be causing this issue? Could there be a synchronization or local Thunderbird setting that changes the read/unread status?

Could you please advise what I should check or change to fix this?

Thank you.

Hello, since few times it is impossible for me to connect to my mail serveur (sfr.fr) using thunderbird. I get an error message and it don't work even iI feel the good password (this one in functionning with SFRmail app.). I am using thuderbird for a long time and I should appréciate to use it anymore. Please see below a screen copy. Thanks in advance for your help, Regards, PATRICE Lagouy

Hello,

I am experiencing an authentication problem with an iCloud Mail account in Thunderbird 153.0.3 (64-bit) on Windows.

The iCloud Mail account itself works normally. I can access my mailbox through Apple's web interface, and I was also able to add the same account to Microsoft Outlook and successfully send an email from it.

The problem occurs specifically in Thunderbird.

When I initially add the iCloud account to Thunderbird, the account connects successfully and my mail is downloaded. However, after completely closing Thunderbird and launching it again, Thunderbird asks me to enter the password again. When I enter my current Apple app-specific password, authentication fails.

I have already generated several new app-specific passwords and tested them. I also tested both the username without the domain and the full iCloud email address as the username. The result is the same.

Current IMAP settings:

Server: imap.mail.me.com Port: 993 Connection security: SSL/TLS Authentication method: Normal password

Thunderbird does not offer OAuth2 as an authentication method for this account. The available methods are Normal password, Encrypted password, Kerberos/GSSAPI, NTLM and TLS certificate.

The Thunderbird log shows that the connection to the Apple IMAP server is established successfully. The server reports the following authentication capabilities:

AUTH=ATOKEN AUTH=PLAIN AUTH=ATOKEN2 AUTH=XOAUTH2

Thunderbird then attempts PLAIN authentication, but the server responds:

NO [AUTHENTICATIONFAILED] Authentication Failed

Thunderbird subsequently tries the old-style authentication method, which also fails with the same error.

I have also tried changing the IMAP port from 993/SSL-TLS to 143/STARTTLS, but the connection to imap.mail.me.com:143 fails as well.

The most unusual part is that the account works immediately after being added to Thunderbird, but stops authenticating after Thunderbird is restarted.

Could this be related to Thunderbird's handling of iCloud app-specific passwords, the password manager, the Thunderbird profile, or a compatibility issue with the current Thunderbird version?

I have attached the relevant Thunderbird IMAP log.

Thank you.

Contacts stopped syncing with Gmail. Followed various troubleshooting including deleting address book and trying to reinstall, and cannot reinstall Gmail address book.

Contacts stopped syncing with Gmail. Followed various troubleshooting including deleting address book and trying to reinstall, and cannot reinstall Gmail address book.