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Hi, I' ve been using Thunderbird for years with no problems, but the other day my servier changed their settings and now Thunderbird won't recieve any of e-mails. They sent me settings and finally I figured out them to work on my phone, but not on Thunderbird. The new serivcers address is "ny201.whpservers.com" and the incoming port is 995 and the outgoing port is 465. I used the same settings that I used for my phone, but they won't work on Thunderbird. I'm supose to use SSL for incoming/outgoing messages and when I use testing connection to server I get a message of "The certificate for mail.dostie.net:995 is not valid for that server. Someone could be trying to impersonate the server and you should not continue." Can you please provide help to resolve this issue.

Thank you Donald Dostie

I have a number of pop3 accounts with the same mail host, but suddenly one of them gives me the message "Unable to write the email to the mailbox. Make sure the file system allows you write privileges, and you have enough disk space to copy the mailbox."

I use Thunderbird on two Windows machines, and the problem is on both, so it is something in the interaction with the server, however, there is no problem accessing the mail via webmail directly on the server.

I have tried to change password on the account, but the problem did not go away. In fact, I got the box to tell me that the old password did no longer work, so I know that the problem pops up after log in to the account. Before the error message appears, the message "downloading 208 messages" (or something similar) briefly appears.

Is there a way to find out exactly what fails?

в моменте браузер перестал запускаться , я люблю твикать и оптимизировать виндовс подумал дело в ней , но переустановил виндовс скачал обновления виндовс и начал по одному шагу оптимизировать и делать настройки виндовс , по итогу настроил точно так же как и раньше , но браузер работал , скачал античит фейсит и перестал работать , сейчас переустановил виндовс не настраивал вообще только скачал браузер и античит фейсита и браузер перестал запускаться выдавая ошибку

It's been almost a week now, and my 2 Microsoft email accounts will not connect to Thunderbird anymore. All was fine for years, but something changed that I can't figure out!?! I have gone to my Microsoft email server and checked that my passwords still work. I even updated one and it works on Microsoft server but not Thunderbird's!?!? I even deleted one email account from Thunder bird to re-install it, but when I tried a fresh re-install Thunderbird still won't connect to Microsoft server??? I'm at my wits end, and may abandon Thunderbird completely if someone there doesn't help me connect!!!

The attached message pops up when in coming mail is coming in, not anything gong out. How can I fix this. See attached image. I have checked my sent messages..nothing shows up..I have checked my out box in local folders still nothing shows up

Since yesterday (27 Apr 2026) any and all mail that comes into Thunderbird gets marked as SPAM. I searched online and found people saying that I could reset the junk training filter, so I did this, but incoming mail was still marked as spam. The next suggestion was to delete the training.dat file. Did that, restarted Thunderbird and incoming messages are still marked as spam. The last suggestion was to turn off adaptive junk mail controls. Didn't want to do that because I assumed that it would let spam through. Nope. Turned it off, restarted Thunderbird and two emails from my work came in and got flagged.

I'm running version 140.10.0esr (64-bit) on Windows 11. I am using IMAP to connect to the mail server but it's not running any spam detection software (like Spamassassin). I know this because it's my server and even if it was, no updates have been preformed since the first of this month and this just started happening yesterday. Combine this with the bug that Thunderbird notifies me of incoming mail, even if it's spam (didn't post about this because there are plenty going back a couple of years), is starting to make me look for an alternative.

OK, so I see where others Thunderbird users have previously asked about why e-mails are disappearing from their Thunderbird junk folder but have a quite different problem. So, when I go to my junk folder momentarily all the mails are present, but then right before my eyes 2 or 3 just simply disappear! They truly disappear and are nowhere in any folder on Thunderbird account -trash, archives, sent, etc. I did the obvious and Googled and there are some informative posts about Thunderbird settings for time-outs and filters and automatic deletion - BUT, BIG BUT all my settings conform already to all their suggestions on these various web posts. So at my wits end I ask the folks in the community if they have any explanation as to why e-mails in junk folder on Thunderbird literally just disappear in front of me. I would be greatly appreciative of any suggestions.

I was told to post here by mozilla dev from google play

When typing in firefox with samsungs keyboard it's bulit in predictive text cuases words your trying to type out to be put twice or random letters along with the word causeing you to have go back and retype the word you wanted to type out this can happen several times only temporary fix i found was turning off predictive text

Thanks.

I was a Thunderbird user for a long time, and so signed up for monthly donations in support. But I ended Thunderbird use when switching to a new computer, and now I'd like to cease that monthly automatic billing. But the Donor Portal doesn't work - the login link is never sent. So how do I terminate this monthly billing?

When I tried logging into my bank account today using firefox it says that I entered something wrong and wont let me log in, it has always worked before. I tried using Edge and logged right in

I lost my windows 11 computer, and need to restore all my missing Local folders in my new computer that I have just installed Thunderbird. I think I need to delete everything under c:\user\myname\appdata\Roaming\Thunderbird\*. Tried this and still no Local stored emails found when I brought up Thunderbird? I have years of data stored there and really need them.

I have Thunderbird on another PC that shows the incoming emails with the contents with the contents displayed under the email list, yet on my new PC I cannot seem to get that setting. I have to double click an email and it opens a new tab. I have used your help and also YouTube to no avail.

Hello Firefox VPN installatiion starts with the instructions etc as shown in the image attached Slight problem in that the VPN Icon doesn't appear on the toolbar How do I load it?

cheers

john

Firefox just updated, now getting ACCESS DENIED at common sites, Home Depot, JC Penney, American Airlines, United Airlines and I don't know how many more.

How do I fix this or go back to previous versions of Firefox?

Or just move to Google?

Hi I am using Firefox for Android version 150.0.1 on Android 15. I am facing UI misalignment issues continuously. UI always drops down or goes up (whitespace on top) on every toggle between normal and private modes.

Please check attached step by step numbered screenshots and let me know if there is any possible fix.