Thunderbird Community Forum

After many years of using TB without any problems on an older computer with Win 10 I suddenly have this confusing little hiccup. If I hit New Message, Reply or Forward a small rectangular box (about 8 x 100mm) appears with a shaded outline in the centre of the screen where the body of the email would go. There is also a black lock with a red line through it at the start of the "Subject" line of the blank email, I don't think I have seen it there before but I maybe wrong.

Clicking inside the box gives nil response except on the far right on the formerly black X that has changed to a white X with a red background when it just deletes the whole page. No amount of right or left clicking outside the box gives any response except for the "error ding sound" and the box jiggles. The box can be dragged to the edge of the screen without any change in responses.

All other email functions work normally, there are no problems with receiving, reading or deleting emails. I do not know how to find out what version of TB that I have installed. So to sum up if I hit New Message, Reply or Forward the only thing TB will let me do is delete the new blank email that I want to send (once it is completed). I have not got the foggiest idea of what to do to fix the problem.

I have created daily tasks to remind me to do certain things. When I dismiss these in the reminder dialog box, they are colored Red in the Task Pane but not complete, and thus they remain in the Task Pane. Is there away to delete these Red task in mass, i.e., highlighting them and deleting them? Or is there a better way to dismiss them when they pop up so they disappear?

Thank you,

Since setting up Yahoo email on TB using POP3 setting, I noticed that while all my Inbox messages remain when downloaded on my PC, the Sent messages are being gradually deleted to leave only the most recent (currently) 11 messages, like it is if I log in online to Yahoo webmail. Does this mean I need to configure it to IMAP as well to make sure nothing is deleted once downloaded to TB on my PC?

On 6th Feb 2026 a professional set up Thunderbird [149 I think] on my Desk top computer, running Windows 10, with 2 email addresses. Last week I found I could receive emails on both, but not send on either. I know the passwords for both the addresses, but even if I put them in when asked, I still could not send. Then I found I was not receiving e mails on either address as well. I am 87 and may have changed something important, in an effort to find a solution, as last Friday [27th March] thunderbird crashed. I sent the report to thunderbird. Yesterday I received the previous day's emails and current ones. Today [29th] I am receiving, but not able to send again, My email default is set as Thunderbird. For many years I was with Plusnet, but recently I had to transfer to Greenby. I checked their Web mail when I was not receiving emails and they were on their Server. I can make simple changes in Account Settings eg Port, Outgoing Server, Security.. Is there a simple solution or should I call the Professional again? Thank you.

Email (from gmail) is not downloading. Thunderbird updated yesterday and I can't download today's emails; it gets stuck on "check mail server capabilities." If I go into Gmail it's there, but it's not coming in on Thunderbird

When I select Thunderbird email it responds very slow. When I select a message, the message does not show up. My email is carolinascene.com and my hosting company is AIT. Advance Internet Technology. What can I do? Call me because I do not get email. [edited phone# from public community support forum] anytime. Thanks! Gerald Robinson I have donated and will again!!

We have an email account that is gmail behind the scenes but uses a front end alias (e.g. name@organisation.ca). Adding the email account to Thunderbird is no problem, TB recognizes that it is a gmail account. However, it does not automatically add the address book. I tried to add manually using the new Accounts Hub CardDav putting in the email address under UserName and putting in imap.gmail.com:993 for the URL/Hostname. It does not work and I get the error: Component returned failure code: 0x80004002 (NS_NOINTERFACE) [nsISupports.QueryInterface]

Nie mogę wysłąć wiadomości. Przy póbie wyslania odpowiedzi na otrzyany e-mail wyświetla się taki komunikat

Wysyłanie wiadomości się nie powiodło. Wystąpił błąd podczas wysyłania wiadomości: błąd serwera poczty wychodzącej (SMTP). Odpowiedź serwera: * OK IMAP4 ready

This started happening about a month ago, without me changing my settings, which are to retain all emails unless manually deleted. Probably relatedly, copies of sent emails are not saved in the Sent folder. This is my account on yahoo.co.uk - all the emails are available when I go to yahoo through my browser, so it is just Thunderbird that is not ertaining them. I automatically accept Thuderbird software updates (now 148.0.1)

Starting with Thunderbird 149, the Find command (Ctrl+F) no longer reports the number of matches; nor which match you're on, like "3 of 8 matches". I really miss that feature; please bring it back.

Today I have experienced a problem downloading new messages, bulk, trash or anything else in my mail server into thunderbird. it requires my primary password and then my regular password. I just set up my primary password so I understand why it is asking for that, but I don't understand why it is also asking for my regular password before I can get access to the mail server that I am using. the regular password was set up on 6/17/24 and until today it was working fine.

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.

I am currently unable to login into my Thunderbird account. My email provider (Internet Lightspeed) told me to go into Tools>Settings > Privacy & Security > Certificates > Manage Certificates. In the Certificate Manager, go to the Servers tab, click Add Exception, enter the server address which is imap.lightspeed.ca. I did that and got the following response: This site provides valid, verified identification. There is no need to add an exception.

The Certificate Manager/Servers window now shows imap.lightspeed.ca:443 as the Server. Lightspeed says that is correct and need to contact Mozilla Thunderbird. Thunderbird updates are current. Any suggestions? Patrick

hello, i cannot seem to find a solution online, hopefully someone can help.

i often receive emails with images attached, and most of the time people don't resize their images. you can imagine over time this all adds up in the email storage folder total size.

i dont always need to keep a 6mb image version, it can be reduced after i am done.

i would like a method to resize the received emails image attachment, to at least still have a smaller copy for refence, but not end up with a huge thunderbird email account profile (in the email received not externally saved)

preferably a one click solution, or even a routine i can run on the file system, etc. or some way to edit the received email and its attachment in program.

thanks