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Any thoughts on this will be very much appreciated. I have 2 email accounts with Yahoo and am using Thunderbird to access them. It used to work properly, but now I can receive emails on both accounts, but can only send emails on one of them. The other account gives me the error message: "Sending of the message failed. An error occurred while sending email. The mail server responded: Request failed; Mailbox unavailable. Please verify that your email address is correct in your account settings and try again." When I then look at the SMTP user name, it shows the name for the other account. When I change that user name to the correct name, I can then send emails on that account, but the process also changes the user name in the second account, such that it no longer allows sending emails. In other words, when I go to 'account settings' and set the SMTP user name for account 1, then go to account 2 settings, I find that the account 1 user name shows up. If I then change the account 2 user name and go back to look at the settings for account 1, I find that the SMTP user name in account 1 has changed to the same as I just changed in account 2. Additional info: Prior to this problem, I had gone into my emails on the Yahoo website and changed the password on both accounts. When I then opened Thunderbird it asked me for the new passwords for each account, as it normally does, and everything looked fine until I tried to send using the one account. Thanks for any thoughts.

I had a defective hard drive that was replaced. I lost the profiles that I had previously on the old hard drive (Except for the profiles from a year ago). Is it possible to reinstall Thunderbird as if it was a completely new program, link it to Spectrum webmail, and recover all my emails still on Spectrum webmail. and also create a new recreated profile. Thank you.

A "send later" button came up one morning instead of the usual "send" button. When I clicked on the write button to see where the "send" button was, several choices came up but when I clicked on the "write" choice I lost the other choices and now can't get back to the original write button and still no "send" button appears anywhere on the menu. I can save messages to Draft but still can't actually send them. I can still receive emails, just can't send them! Help!

To my new computer Thunderbird has just fetched the INBOX-mails from the IMAP-server, not my many subfolders, not the SENT-folder, not the SPAM-folder. This has previously worked when I changed to a new computer. How do I get Thunderbird to transfer these mails.

Running Thunderbird with three accounts on my desktop PC - two 'btinternet.com' accounts and one 'gmail.com' account. Inboxes have no more than 20 emails in them, as I delete unwanted ones and transfer others to various sub-folders ( In excess of 40 No.). Today I suddenly found that incoming emails on both bt accounts were not showing the subject or sender and the content is displayed in plain text (txt) format - no problem with the gmail account.

I have compacted and repaired the inbox folders but no difference. If I send a message from either of the bt accounts to the other the problem occurs, but if I send a message from either of the bt accounts to my gmail account, it goes through fine. I can receive bt emails fine on my laptop. I assume this is a thunderbird problem on my PC but not sure where to start - would be really grateful for any guidance.

On Saturday morning 27 June 2026 I tried to login my Orcon email account via Thunderbird (which I have been using for a long time). But my login didn't work, I got a message saying "login to POP3.orcon.net.nz with username habitation failed." On 30th June 2026 I reported the problem to Orcon.

Orcon gave me the following settings for Thunderbird. I have done that and even made a new account: Incoming Server Type: IMAP Mail Server: imap.orcon.net.nz Port: 143 SSL: Off Authentication: On (username and password required)

Outgoing SMTP Server: Mail Server: smtp.orcon.net.nz Port: 25 SSL: Off Authentication: Off

Since then I have spent many hours and going around in circles with Orcon's Technical Support to resolve this, but no luck. They blame Thunderbird. I used Thunderbird Troubleshoot Mode. The message that comes up reads: login to server mail orcon.net.nz with username habitation failed. Please can you check that your server settings above are correct? And if there is a bug? Irma

Hi there - I'm hoping someone can help. Following the July 2025 update to Thunderbird, I was suddenly unable to download my email messages into Thunderbird from my Rogers Shaw email account. When I try to do so, I get the error message: "Login to server pop.shaw.ca with username failed. I'm given three options - retry, enter new password (which hasn't changed), or cancel.

Does anyone have any idea what might have changed post update?

I must be doing something wrong. I am new to thunderbird, migrated from Eudora since I can't send mail with Eudora anymore.

I tried to configure Thunderbird as much as possible like Eudora, but ... it doesn't receive nor send mail. On the surface it looks fine, it seems thunderbird logs into the server, it seems it sends mail and checks for new mail, only I don't receive anything, nor send anything even though it looks it does. So what am I doing (or is going) wrong? (I can still receive mail with Eudora and today I checked and received 54 mails, none with Thunderbird)

Sehr geehrte Damen und Herren, guten Tag. Seit einigen Tagen kann ich keine E-Mail mehr versenden. Fehlermeldung: Senden der Nachricht fehlgeschlagen. Die Nachricht konnte nicht gesendet werden, weil die Verbindung mit dem SMTP-Server ihre Ablaufzeit (Timeout) überschritten hat. Versuchen Sie es nochmals.

Ladies and Gentlemen Good day. I haven't been able to send emails for a few days. Error message: Failed to send message. The message could not be sent because the connection to the SMTP server timed out. Try again.

Windows 11 Pro - Vers. 23H2

Thunderbird will no longer send E-Mail but still works for incoming E-Mail. It provides the following error message:

Sending of the message failed. The message could not be sent because connecting to Outgoing server (SMTP) outbound.att.net failed. The server may be unavailable or is refusing SMTP connections. Please verify that your Outgoing server (SMTP) settings are correct and try again.

The Outgoing server is configured as follows: AT&T / outbound.att.net / 465 / SSL/TLS / Normal Password / E-Mail

This configuration has not been changed in years. Everything I can find on line suggests this configuration should still work. Any suggestions you could provide would be appreciated.

Tom

Been getting a bunch of this, usually in my TB TRASH folder, I think from the Outlook online server.

The server couldn't retrieve the following message:

Subject: "<Removed for PII>"

From: "Not available" ("Not available")

Sent date: 10/31/2024 2:25:02 PM

The message hasn't been deleted. You might be able to view it using either Outlook or Outlook Web App. You can also contact the sender to find out what the message says.

I have 2 personal email accounts: Outlook and Gmail. My client is Thunderbird. Running Win11 25H2. Far as I know, problem began recently. This is a screenshot of some messages from TBirds TRASH folder.

User's image (In images) Thunderbird just tried to fetch emails. Got a notification that it could not get messages, this time from GMail.

What does this mean? Outlook/Gmail servers or Thunderbird? What do I need to do?

Thunderbird can not receive emails but it can send them. Password is correct.

  ( Login to server pop.verizon.net with username ... Failed
    Connection timed out)

Account Settings -> Server Settings:

   The certificate for pop.verizon.net:995 appears to be valid.
   When viewing the certificate it is out of date.
   No option to add an exception here or under Manage Certificates

On another user on the computer Thunderbird is working.

Thanks

Hi,

I recently installed Thunderbird on a news Windows 11 computer. While setting up the account, I made the mistake of changing my gmail account from imap to pop3. After changing the settings in my account to allow this change, Thunderbird started downloading thousands of old emails. When I realized my mistake, there was nothing I could do to stop emails from downloading. Even after disabling pop3 in my account, the emails continued to download. Unfortunately, I haven't got the time or patience to delete thousands of emails one at a time. I tried uninstalling Thunderbird and reinstalling using IMAP instead of POP3. No luck. The emails continued to download.

Is there anything that can be done to stop this?

Thanks, Ed

After getting fed up with the Outlook app on windows. I decided to switch to TB. Now i can recieve my mails but can't send. I don't Use VPN and also checked if Windows Firewall is screwing things up. But those are allowed

Without the following. Unable to login to server (SMTP) smtp.office365.com with username *****@hotmail.com has failed (Translated from dutch)

These are my Settings incoming IMAP server: outlook.office365.com, 993, SSL/TLS, OAuth2 authentication, User Name = *****@hotmail.com outgoing SMTP server: smtp.office365.com, 587, STARTTLS, OAuth2 authentication, User Name = *****@hotmail.com

I am having an issue with retrieving my email in Thunderbird. On laptop, using Version 140.2.0esr | Released August 19, 2025. No changes were made to Thunderbird settings. The email is showing up in the Comcast portal, but for now having it forwared to a Gmail account. Tried changing password in Comcast (and in Thuderbird) to no effect. Tried deleting my Comcast email account in Thunderbird and re-adding it, but no change. Can send out email fine, just receiving it is the issue.

Interestingly, I use BlueMail on my phone and it, too, has the same issue and will not retrieve from Comcast. Thanks in advance!

I have two email accounts, one is hotmail.com, the other is on outlook.com

The SMTP for the outlook account works fine, but Thunderbird puts that same smtp details into the Hotmail account smtp. That also puts into the Hotmail username, the outlooks email address.

If I try to send an email using the Hotmail account, I get a message saying 'Hotmail can not send using xx@outlook.com

If I use the settings to make the username xxx@hotmail.com, it puts that into the smtp of the outlook.com address then that will not send giving the same fault. This has only started this last couple of days, nothing changed in the settings.

This only occurs on my Desktop. On my laptop with same settings it works fine.

Thunderbird is showing up to date?

Help Gerry

I mucked up my decades old Thunderbird e-mail account on my desktop. After a password change in Spectrum webmail, I lost the ability to receive and send e-mails using my old pop-server account. I tried many things at this communities recommendations but no success. So I changed the name of my old e-mail address and then created a new email account with my former e-mail name and also set up the new e-mail account to an IMAP account. Then when prompted for a password, I correctly inputted the Spectrum webmail password and now I receive e-mails to this account on Thunderbird! Hurray!! However, I still cannot send out e-mails from this account as I get the message that the outgoing server "(SMTP) mail.twc.com" timed out. And no - it is not an antivirus issue.

By the way, my phone e-mail account of the same address is able to send out e-mail messages. However, I wish to handle my most sensitive messages to send off of my desktop version of the same e-mail address and that is where I am not able to send an e-mail.

Yikes - Thunderbird.

I am trying to send a message to my cousin Gundula Loude whose e-mail address is gcloude@bluewin.ch. Unfortunately, the message is blocked for a reason I do not understand. There has been one other e-mail complaining about this problem but I do not understand why the blocking still prevails. Can you investigate and let me know how I get round this deliberate blocking.

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