Thunderbird Community Forum

I have been using our work Mozilla Thunderbird account for two years and in all that time we have been unable to send emails from our usual email address (sales@freunduk.com) to anyone with a Gmail account. We get no bouncebacks and no indication to say that the email has not been received. Everyone else with other types of email account such as Hotmail or Outlook etc get our emails, but for some reason Gmail is blocked. We send invoices, quotes etc from Mozilla and for anyone with a Gmail account, not receiving our email is very inconvenient. We have put customers on stop for non payment and then realised they haven't received our invoice via email because they have a Gmail address. Can anyone shed any light on the matter please? Is there a setting we are missing which needs changing? I have tried to search previous questions on the forum but nothing has been obvious. All help appreciated.

mon compte [edited]@numericable ne peut plus recevoir de message. on me demande le mot de passe de pop.numericable. Sur les paramètres de sécurité j'ai SSL/TLS et authentification "mot de passe normal". je ne sais pas comment faire pour retrouver ma situation fonctionnelle. Merci de votre aide. Envoyer vos réponse sur mon autre adresse mail [edited]@gmail.com ou un sms au 0033[edited]

When my message filter uses the "Reply with Template" action, the reply e-mail is always PGP encrypted, even when I do not have any public key for the recipient e-mail address. As a result, the reply e-mail is always corrupted.

I am using Thunderbird 140.7.1esr on Windows 10.

I have attached a screenshot of what the reply e-mail always looks like.

In the Template that I am using, the "encrypt" button is not selected, and in the OpenPGP menu of the Template, the "Encrypt" menu item does not have a checkmark next to it.

Does anyone know how I can get Thunderbird to send reply e-mails without using encryption?

I am having a major issue with Thunderbird not saving Outgoing emails in Send Folder with IMAP setting.

Having three mailboxes two are set to IMAP and the third set to POP3. The IMAP outgoing mail creates an alert that mail was sent but copy not placed in your Sent folder due to network of file access errors.

Outgoing mail in POP3 save immediately to the Sent folder.

I am using the latest Thunderbird update:

• Server Type: IMAP Mail Server
• Server Name: IMAP.kinect.co.nz
• Connect Security: SSL/TLS
• Authentication Method: Normal Password

Outgoing Server [SMTP] Settings:

• Description - User name
• Server Name: smtp.kinect.co.nz
• Port: 465
• Connection security: SSL/TLS
• Authentication method: No authentication

Note: Authentication was changed form Normal Password in order to gain some traction on the issue during trouble, cause and correction actions.

Addendum: The PC was fitted to Starlink https://en.wikipedia.org/wiki/Starlink in preparation for use as sole source for internet connection. That was abandoned due to email issues.

I am unable to send emails from Thunderbird. Getting the message: An error occurred while sending mail: Outgoing server (SMTP) error. The server responded: Connection from xx.xxx.xx.xxx refused.

When I check my password under "Tools - Security', I only see a password listing for my 'incoming' server [that I do not have a problem with].

My out-going server setup has "Authentication" as normal password. When I try to send an email, Thunderbird does not ask for a password. Is it possible the error message refers to lack of a password? If so, is there anyway to manually add an STMP password to Thunderbird?

Per un guasto sulla linea Vodafone, il mio PC ha avuto problemi. Ora sono tutti risolti, meno uno. Ho ritrovato tutta la mia posta su Mozzilla Thunderbird, ma non la rubrica. Come posso fare per ritrovare anche la rubrica? Grazie.

Hello - I suddenly cannot send or receive emails in Mozilla - if I go online and do it via the Spark App, it is working, so not my server.

Your advice please?

We have our accounts on one computer and one dedicated email (using Thunderbird) which sends our invoices to our customers in PDF format as an attachment to an email. This stopped working a few days ago. The tech department of our accounts package supplied by Benchmak/Snip has looked at our system and the only thing they can suggest is that the emails are being blocked because may be Thunderbird thinks they are SPAM. We have been using this system for a couple of years now and has been fine. We can send and receive emails to/from this account, it's only the PDF attachments of invoices which isn't working. Can any one help please, thank you.

My computer crashed and so restarted it, when went to open thunderbird got a couldn't load XPCom message. Followed directions to reinstall thunderbird without using the uninstaller. When I installed it, I reloaded my email to set it up. I have lost all my latest emails, only getting them from 15 years ago. and today, nothing from this year. All my folders have also gone and my contacts.

Can someone please help, how do I fix it, I have emails from this year that I need to keep.

I was using Thunderbird Portable 136.0.1, from Portableapps.com . I then upgraded it to Thunderbird 146.0.1, by following Portableapp's instruction of installing the Portableapp 146 version to the same path of the old installation.

I then I added an Office365 Business email account to Thunderbird, but there was a problem with the SMTP configuration. I tried to change it, but then I found out that there's something wrong with my Account Settings for all accounts; they don't save the changes.

Let me explain: if I right click an account and choose "Settings", a new tab opens [image 1]. Whatever changes I make there, to "Account Name", "Your name", "Color", etc. don't get saved; as soon as I switch to another account and come back they are gone.

This also applies for "Edit outgoing server..." at the bottom. It always reverts to "Default server" and then every time I want to send an email I must change the default SMTP settings to the right settings of that specific account.

The "Delete" button for deleting the account also doesn't work, if I click it nothing happens.

Interestingly, if I switch to "Server settings" or "Copies and folders" the changes there do get saved and are displayed correctly for the different accounts.

What can I do to solve this? I already tried Troubleshooting Mode to no avail. I am currently trying to install Thunderbird Portableapp to a different folder, how can I then import all local folders and accounts to this new install?

Thunderbird version number: 148.0.1 Mail provider: Yahoo Client OS: Windows 10

The issue and steps I tried to resolve: On 1 Jan 2026 I switched from Outlook client on my Windows 10 PC to Thunderbird 146.0.1. I did not import any user data from Outlook but started with a clean install of TB for the new year. I use yahoo.com with POP3 as my email provider. Server Settings: Server Name "pop.mail.yahoo.com", port 995, SSL/TLS, OAuth2 Outgoing Server: Server Name "smtp.mail.yahoo.com", port 465, SSL/TLS, OAuth2

it all worked fine and I was very happy with the setup. Then from early to mid-February I was unable to use my computer. When I finally accessed Thunderbird again, it connected to Yahoo and showed that approximately 800 email messages would be downloaded and started downloading them. After downloading about 100 messages, Thunderbird timed out and I haven't been able to get it to work since.

I have read and followed or tried to follow these articles plus others that I may have forgotten about (not listed in any particular order) - OAuth2 Authentication for Yahoo, AOL and ATT | Thunderbird Help - including all the steps in Please check the following before asking for support - POP access settings and instructions for Yahoo Mail | Yahoo Help - Automatic Account Configuration | Thunderbird Help - Manual Account Configuration | Thunderbird Help - Thunderbird and Yahoo | Thunderbird Help - Send and receive messages in Thunderbird | Thunderbird Help - Can no longer get emails | Thunderbird Support Forum | Mozilla Support - Emails suddenly stopped downloading to Thunderbird 140.2.1esr | Thunderbird Support Forum - Get Messages | Thunderbird Support Forum | Mozilla Support - Cannot receive messages | Thunderbird Help - Problem with Thunderbird working with Yahoo Mail acccounts. | Thunderbird Support Forum

I have removed all messages from the Yahoo inbox and tried to find one or more messages that may be affecting the download. I don't know the best way to determine that.

I use Windows Defender for my antivirus. I don't see anything in Defender that blocks or scans email messages which would prevent downloads, although I could be wrong about that. if this might be the issue, please provide some guidance about how to check Defender.

I have uninstalled and re-installed Thunderbird. In the process I downloaded the setup file for Thunderbird Setup 148.0 and installed that version. It later auto-updated to 148.0.1. Before installation, I removed all external connections from my Yahoo account and completely removed Thunderbird from my PC, including the profile and profile.ini. When I reinstall and switch the account to POP3, Thunderbird captures the App password from Yahoo and connects just fine. But it still times out while attempting the first download of a message. The first several times it timed out, an error message was displayed but now it doesn't show anything. Except no messages are downloaded.

At this point, I don't know what else to try. Since I don't have much experience with Thunderbird, I don't know how to troubleshoot the process (logs to look at, etc.). I don't want to go back to Outlook but I need the email client to work and download messages. Any help would be much appreciated.

Using Thunderbird, when updated to version 148 (64 bit) the highlighted color is dark and does not contrast to the text color (black) so it is hard to read. How to change the color? or the color of the text?

i was trying to change my password to correspond with my other server so i thought changing my password was just to do that but i removed even the primary one that was made 15 years ago and do not have it written down . so now i cannot open up my thunderbird emails or send anything because i do not know the primary password and you guys do not show anywhere i can change that without knowing my primary. which is a joke.

I have my incoming IMAP emails stored on my local computer drive where the default Thunderbird installation puts it. This is fine.

My question is, can I move the local folders directory to another external drive or network attached storage? I am doing this as I have a small local SSD and combining all emails the size is massive.

We tried installing Thunderbird on two PCs, both running Windows 11, but with unsatisfactory results. In July 2025, we bought a 15-inch HP PC running Windows 11. Thunderbird was installed, and the sending and receiving functions worked correctly with one domain name and three email addresses linked to that domain name. In January 2026, we bought a Lenovo T14 PC running Windows 11. We tried installing Thunderbird with the same domain name and three different email addresses linked to that domain name. Result: On the T14, it was impossible to install the third email address; only two addresses could receive and send messages correctly. Furthermore, the 15-inch HP PC now receives messages but can no longer send them; the connection is rejected by the server. Analysis: Apparently, there is an inability to coordinate the two PCs for Thunderbird. Question: Windows 11 had numerous updates between July 2025 and January 2026. Do both PCs need to have Thunderbird installed the same version of Windows 11 ?

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

Hello, I get oftem spam mails with a header like the following: from:Singles50 subject:Momenti speciali insieme per gli over 50 Reply-To:reply_to@miracel001.entrydns.org>

I tried to create a filter adding as personalized condition "Reply-to" that Thunderbird saves in the msgFilterRules.dat as: condition="OR (\"reply-to\",contains,@miracel001.entrydns.org)"

There is no way to get any filter working, do you have a suggestion on how to fix this issue ?

Thanks

Hello everybody. Since today or yesterday, my Thunderbird has stopped refreshing the list of messages. The number of new/unread messages in the Inbox and other folders is shown and updated right but the main window with the list of the messages does not get refreshed and only shows the last message from couple days ago.

I've tried to follow a bunch of guides and ideas (repairing folder, deleting .msf files...) and even removed the account and tried adding it again. The list of folders is right but now there are no messages at all. All folders look empty.

I've found out that in the folder on the disc where there are supposed to be the "INBOX.msf" and "INBOX" files, that the "INBOX" file without the file type is missing. And it's the same with every message folder, there are only .msf files on my PC where I removed and re-added the account. On my laptop, the "INBOX" file still exists but does not get updated.

This thing is happening with only one of my e-mail accounts, the others get updated fine and new messages are shown. It is IMAP server, imap.atlas.cz, Port 993, SSL/TLS with a password.

Can anyone help please?