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I have three separate Yahoo email accounts. I set up Thunderbird to link to each Yahoo email account separately. It worked fine for a year or more. On 5/25/26 one of the three Thunderbird email accounts stopped downloading emails from Yahoo. I could see at the bottom bar Thunderbird indicating that is was downloading 1 of XX emails, but never actually downloads them. There is no error message. I checked the Yahoo email account to verify the number of emails I am missing from Thunderbird and the number is correct. I can see the emails in Yahoo. I'm the only person using Thunderbird, so no changes have been made to previous settings for retrieval. I confirmed Security and server settings for Thunderbird in and out going emails, and Yahoo are correct. I tested the connection in Thunderbird, and the connection is successful. I tried to send an email from the Thunderbird account having issues, and the email was sent and received by the recipient. The recipient replied, and Yahoo received the email, but failed to download it to Thunderbird...along with all the other emails since 5/25/26. I unlinked the account and reestablished the link between Yahoo and Thunderbird, and still not fixed. I tried restarting the computer, with no change. I tried to send an email from Thunderbird to one of the other Thunderbird emails and it was sent and received. I made changes to Thunderbird to force the download of emails, and it still wouldn't do it. I turned off my antivirus, closed Thunderbird, and restarted it, and that didn't change anything. The capacity of emails on the email in question only has 739 emails, so it's not over the limit and I have plenty of storage capacity. Thunderbird is set to save emails, Cookies and cache were cleared, no change. I ran the folder repair feature in Thunderbird, but there was no change. I compared all the settings between the other Thunderbird emails that are working against the one that isn't, and they are all the same. There was a suggestion to close out of Thunderbird and delete the "Global-message-db.sqite" file from the Thunderbird profile in case it was corrupted, and it would recreate this file when Thunderbird was restarted. The file was recreated, but it didn't fix the problem. There was mention that a suspicious email in Yahoo might be blocked by Thunderbird, so I placed various emails in the spam folder, and it didn't work. I did find one email in the Yahoo spam folder that was dated before 5/25/26 and moved it to the Yahoo inbox. Lo and behold, that one email downloaded to Thunderbird. So there is something within Thunderbird preventing emails from downloading after 5/25/26. I've read many people complain about similar download failures with no solid fix. Someone mentioned it fixed itself on a day, but then stopped again days later. Someone else mentioned Yahoo changed its password protocol to transfer emails, but that doesn't make sense since the other two are still downloading based on the "old" password protocol. I'm at wits' end. Thanks for reading all of this. I hope someone has a solution.

I have been receiving the error message quoting the SCO1 policy about reaching my sending limit every day recently. This has happened even when I have only sent 1 or 2 messages and these have only been to a handful of people.

"Sending of the message failed. The message was not sent due to exceeding the allowed number of recipients. The server responded: Policy-SC01 You’ve reached your sending limit. Don’t worry, you can send again soon.."

I have seen a previous strand where this was explained as being something imposed by the email provider not Thunderbird. However I have managed to send emails from the website of my email provider that I haven't been able to send through Thunderbird. This suggests that the previous answer was wrong. I would like to use Thunderbird so please help me sort this out.

"connection to server pop.mail.yahoo.com timed out" I have been getting this message in the activity manager for about a week now. When I click get messages, it says down loading message 1 of 1, but nothing happens.

I regularly get the following message when attempting to send an email :- "Sending of the message failed. The message was not sent due to exceeding the allowed number of recipients. The server responded: Policy-SC01 You’ve reached your sending limit. Don’t worry, you can send again soon.." This message implies that I am attempting to send a message with multiple recipients, BUT it only happens when I am sending to only ONE recipient. Why is this, and how do I eliminate this very annoying restriction. I currently cannot send an email because this problem is preventing me from doing so. Thunderbird has been a useful email client for many years, but these frustrations are not helping me to remain with Firebird. Regards, PD

I retrieve email from two different servers, one is mine, one for work, All of a sudden last night I got a spam email from my personal email server, that kept coming in over 100 times, but no other email. My work email is fine. I contacted the hosting company for that server, who was supposed to blacklist that spam address, (my Thunderbird junk button wouldn't do it), but I'm still getting those emails only. Thunderbird tells me there are 110 emails (and counting) on the server, but won't retrieve them. I can see them on my phone, just not my desktop. (I have the phone set to leave emails on the server until I retrieve them with the desktop). I thought maybe it was because I hadn't cleared out my Inbox for a while, so I deleted about half of the 30k emails that were in the Inbox folder, but it didn't make any difference. It won't compact because I keep getting an error that says some other operation is in progress, but nothing is. None of my settings have changed, and I'm still downloading what I think are copies of that spam email, since they all have the exact same Send time. My Thunderbird version is current, v 140-13 oesr 32-bit, on Windows 10. What can I do, thank you in advance. Long time Tbird user, rarely any problems. Image of some of the copies of the spam email.

Hello! All the messages in the sent folder have been lost. When I use webmail, all the messages appear normally. I sent a test message from Thunderbird 151.0 (64-bit) / Windows 10 (64-bit) and the message does not appear anywhere in Thunderbird, but I can see it in "webmail". I added the same email account to TB on another PC and I have the same problem. I have deleted this specific email account from TB and reinstalled it, but the problem persists. In Outlook (iPad and PC) it works normally. Other email addresses of the same domain work normally everywhere. The email server provider cannot help me and claims that there is a technical problem on my side. Is there anyone who has any idea on how to solve this particular problem? Thank you.

Using Thunderbird 115.18.0esr Supernova 64-bit on Mac laptop OS 10.13.6. Worked fine for years, with ongoing Thunderbird updates, even though Mac OS is 32-bit. Suddenly, after 10/6/26 can't retrieve emails although I can see them on the ATT Yahoo server website. Can still send emails with Thunderbird. Inbound server settings are: POP server inbound.att.net, Port 995, SSL/TLS, Normal Password (I long ago created a Secure Mail Key, and even tried creating a new one). But inbound server name doesn't show in Saved Passwords (only outbound server with Secure Mail Key as password)? I have tried everything suggested, repaired my inbox folder, updated Thunderbird files, etc. in Profile as recommended. But still no prompt for password when attempting to get messages. Just shows "Done" at bottom left with no new messages received. But new messages are seen on server website. So it appears that Thunderbird isn't able to connect to the ATT Yahoo server to get emails. Why? And what else can I do? I love Thunderbird and want to continue using it.

With the new meadow update when either replying to a message or selecting new message there is no command menu bar to send save as draft etc.... tried several of the commands an setting changes but nothing seems to work - can do cntrl+enter to send and that s about it....

Hello, I can't receive any of my e-mails. I can send e-mails out now. Plus I can put in my password to log into my e-mail. This has been a headache for me, I have been with Thunder Bird for years.

I also get a boxes that says : Unable to write the email to the mailbox. It says to make sure the file system allows me to write privileges, and I have enough disk space to copy the mailbox. I have enough space on my computer system and all. Another box that says my e-mail is being processed. Please wait until processing is complete to get messages. I did e-mail you yesterday on these issues. As I said I can e-mail messages out now also log into my e-mail with my password. Thanks, Chris

Hello,

I have been using Thunderbird for years without issue, but three days ago, I started having issues.

Now, I don't receive emails when I open Thunderbird. If I delete my password and re-sign in, I receive emails, but cannot send them. Trying to send an email makes Thunderbird ask me to sign in again.

I have two email accounts that I use with Thunderbird. Both accounts have this issue. I have this issue regardless of the network I'm in (work, cell hotspot, or home).

Things I have tried:

• Verified that my IMAP and SMTP settings match the guidance from email servers.
• Verified that my computer firewall is not blocking email.
• Tried connecting on different networks (so different ISPs)
• Deleted and re-entered passwords for each account

Here my current server configuration:

• Email 1 (@gmail.com)

 * Server Name: imap.gmail.com
 * Port: 993
 * Connection Security: SSL/TLS
 * Authentication Method: OAuth2

• Email 1 Outgoing Server:

 * Server Name: smpt.gmail.com
 * Port: 465
 * Authentication Method: OAuth2
 * Connection Security SSL/TLS

• Email 2 (@[university].edu)

 * Server Name: outlook.office365.com
 * Port: 993
 * Connection Security: SSL/TLS
 * Authentication Method: OAuth2

• Email 2 Outgoing Server:

 * Server Name: smtp.office365.com
 * Port: 587
 * Authentication Method: OAuth2
 * Connection Security SSL/TLS

I will greatly appreciate any help you can provide!

In einer frischen Thunderbird-Installation (getestet mit 140 ESR und 147) funktioniert der manuelle globale Abruf per Shift + F5 nicht mehr für POP3-Konten.

Konkret: – POP3-Konten sind korrekt eingerichtet – „Beim Starten auf neue Nachrichten prüfen“ aktiv – „Alle X Minuten auf neue Nachrichten prüfen“ aktiv (z. B. 2880 Minuten) – Thunderbird ist online

Erwartetes Verhalten: Shift + F5 bzw. „Alle Konten abrufen“ prüft die POP3-Konten und holt neue Nachrichten ab (wie in früheren Versionen).

Tatsächliches Verhalten: – Shift + F5 bewirkt gar nichts – Kein Abruf, keine Fehlermeldung, keine Statusanzeige – Gleiches Verhalten bei „Alle Konten abrufen“

Wichtig: Der Abruf funktioniert sofort, wenn man per Rechtsklick gezielt ein einzelnes POP3-Konto → „Nachrichten abrufen“ auswählt.

Das zeigt, dass – Server erreichbar sind – Konten korrekt konfiguriert sind – das Problem ausschließlich den globalen manuellen Abruf betrifft

Zusätzlich scheint Shift + F5 inzwischen nur noch Konten zu berücksichtigen, die für den automatischen Abruf vorgesehen sind, wobei dies selbst bei gesetzten Haken nicht zuverlässig funktioniert. Dieses Verhalten ist weder dokumentiert noch für den Benutzer nachvollziehbar.

Fazit: Der bisher etablierte Workflow „manuell alle POP3-Konten abrufen“ ist in aktuellen Thunderbird-Versionen faktisch nicht mehr nutzbar. Für langjährige POP3-Nutzer ist das eine massive Verschlechterung der Bedienbarkeit.

Ist dieses Verhalten beabsichtigt (Designentscheidung) oder handelt es sich um eine Regression? Falls beabsichtigt: Warum gibt es keinen Ersatz für den früheren selektiven/globalen Abruf?

I'm using Thunderbird 149.02 to make a local copy of all folders, messages and attachments on my yahoo mail account. I don't yet see an obvious way to issue a command to Thunderbird to accomplish this.

I'm using export.imap.mail.yahoo.com as the IMAP server as some of the folders have >10000 messages (none have >100000 messages, and there is no significant real-time email arriving to the account while I do this procedure.)

In settings/offline settings I have "automatically follow detected online state" and "download messages for offline use when going offline [yes].

In account settings/synchronization & storage I have Disk space: Synchronize all messages locally regardless of age"; "to recover disk space, old messages can be permanently deleted..." I have "Don't delete any messages" and "Always keep starred messages"

With these settings, I've tried (from the main menu) File -> Offline > Download/Sync now, then "Download and/or sync..." I have selected Mail Messages, and the Select button takes me to a table where I have selected the main account folder and all sub-folders.

With these settings, Thunderbird appears to go through some of the folders and downloads messages from, them, and after a while says there are no new messages (I don't have the specific text, but it ceases interacting with the server". If I repeat the Download/Sync now procedure, it appears to download more messages, will continue for a while, then stop in the same way.

When I compare the size of Thunderbird's local account folder, it appears to grow after each of these iterations, but is (after half dozen cycles through this) has only reached about 2/3 of the total stoage size reported by Yahoo. While I understand the storage mechanisms would differ significantly between yahoo and Thunderbird, I don't believe I've found a single sure-fire way to accomplish what I set out to do in the first place (which is get a complete copy, through IMAP, of all emails, folders and attachments.

What am I missing?

Thanks,

Dave

Hi, I'm a new user. I cannot send email. Receive is ok.

I get this prompt: Password required for outgoing (SMTP) Server mailhost.zen.co.uk So I add the password, but then I get this error: Login to server mailhost.zen.co.uk with username zen53214 failed. Retry - Enter new password - Cancel I add a new password (the one I use on the zen webmail portal) and I get this message: Sending of the message failed. Unable to authenticate to Outgoing server (SMTP) AUTH command not available at this time. Please check the password and verify the 'Authentication method' in 'Account Settings | Outgoing server (SMTP)'. The outgoing server setup is the following: Description: zen53214 Server name: mailhost.zen.co.uk Port: 857 Connection security: STARTTLS Authentication method: Normal Password User name: zen53214

There is a sync issue with zen email password but I cannot change it on the zen portal, because the password in ThunderBird doesn't have a special character and Zen will not let me change the existing password to one that doesn't have a special character.

What can I do to resolve? Please help. I'd like to stay with ThunderBird email.

Thanks!

Att made me change my account password. Now Thunderbird cannot access messages. I have entered the new password in out going and incoming but there seems to be more to this than that because nothing happens. Where do I have to put in new passwords? Thanks so much. Marjorie

two images. first image, the email that I SENT TO MYSELF, from my android phone, captured a product link, sent the link to me, and opened it on my desktop (or even opened on teh phone) and the HTTP link does NOT indicate it can be open,and if i hover over it, it does not open either.

BUT, if I FORWARD that same email to me (opened on desktop, forwarded to my email, and opened on desktop), it ALLOWS me to open it. why are the links not working if i send myself an email from my phone (where i browse products, etc, and caputere the links)? any assistance appreciated, thanks