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I tried the automated setting up - several times but get the error message below, I tried changing the authentication but same result.

I tried the Help here: https://support.mozilla.org/en-US/kb/thunderbird-and-hotmail - but it didn't help!

I have the settings it shows for Outlook - but it doesn't work! When I "Continue" I get Authentication error. Show less

"Unable to log in at server. Probably wrong configuration, username or password.". It hasn't asked for a password.

I can login in to Outlook webmail and receive messages. Please help. I'm not overly technical but not totally ignorant either! Thanks, Isobel

Certain web sites want to identify my computer ass a trusted device but the cookie that does this is erased every time I shut down Firefox. Is there a way to save a cookie? For these 3 sites only.

Im not sure what the heck happened about a month or so ago, and I have still not resolved it. I did check on thing that was suggested to me, but it didnt really make much of a difference. After an update at about that time, my email folders I made appeared all wacky in the sense that some folders were grayed out, but still retained subfolders (with their contents) in them. I dont know what that means or why they are grayed out. I also noticed a bunch of folders named Userfolder with a number after that. They contain many emails in each one, like they were removed from the original folder they were in. So I dont know, for most of them, what folder I had them in. Im thinking I can try and match them to the grayed folder they might belong to, but not sure on where some go. I have no idea why this happened, and I have been trying to use Thunderbird since then. Im attaching a photo of what part of my Thunderbird, folders & grayed out folders look like. I just want to know how to correct this and get things back in order. I dont know if I did something in the settings or what. Plus this was over a month ago. Ive just been using my yahoo mail account on the web.

Thunderbird has been receiving emails on my PC from Bell Sympatico for years, then suddenly stopped in July 2026 without my changing any settings, and I have to go to the Bell server instead.

I'm using Thunderbird 153.5.Oesr (64-bit) on a Linux machine (Zorin OS).

Most of my email addresses use POP, but with a new email address, I decided to use IMAP. When I'm disconnected from the internet, that particular email address keeps checking for new emails and saying it can't connect. I don't WANT it to connect. A message pops up every few seconds or so and is very annoying. I need to unplug my ethernet cable/adaptor periodically, since it seems to overheat, so keeping it connected to the internet continually won't work.

I have un-selected the boxes in Server Settings to check for messages. See the images below.

Any ideas? Thanks!

First off, mucho thanks to Wayne Mery for kindly guiding me back where I should again ask this question. Here's a copy of the message I posted that Wayne responded to --

> Hi Kelly, et al, > > If this isn't an appropriate place for my question / comment / suggestion -- please advise how to do it properly. > > Several months ago, I had a brief exchange with Wayne Merry(?) in which I communicated that I was "certain" that TB was not showing me ALL (99.99%) of the emails I receive for my several hosted domains. I mentioned that I used to receive 20-30-40 spam messages everyday -- mostly in "junk" (not all). Then suddenly that stopped -- perhaps after upgrading to a new version. Wayne seemed little interested in my problem, but suggested I upgrade to a newer version -- which I resisted (just want a "stable" version that works) -- but I did -- to 140.17 esr. > > That upgrade made little difference (maybe one or two more). That is very problematic for my "business-like" use of TB. I live by email. My business card minimizes my phone # (landline) and mainly shows two big, prominent e-addresses -- my old original e-address from an evil ISP in ATL (druw@oneimage.com)-- AND above that -- my main e-address which is identical to the ISP, but with DRU added to the domain (druw@OneImageDru.com). > > I verified this week that a banker business contact -- sent to both e-addresses -- and I only received the one sent to the ISP e-address. Never received the one sent to druw@OneImageDru.com -- at all. This is similar to dozens of similar situations -- in which I never received any (expected) email -- and had to assume that -- just maybe that party never sent an email (not a lot of email lovers left). > > How can I SEE ALL (99.99%) email sent to my TB -- including seeing ALL spam sent to my TB -- just verify that there aren't any unintended NON-spam messages that are being mischaracterized as spam -- but are not? Is there a particular TB version that has potentially solved this problem? > > Any suggestions for running an other particular IMAP client (not deleting) -- to compare with what I get with TB? > > Merci, > > Dru

Hello Dru. You were close with the name :)

Through https://support.mozilla.org/en-US/user/druw/ I see you previous posting No longer see ALL messages, including spam after upgrade to TB 128.14 Oesr (64, Win 10) from 6 months ago and your older posting More "granularity needed" to "How to turn off Junk filtering / TB 115.10 from a year ago.

The description of planning at https://thunderbird.topicbox.com/groups/planning/settings indicates this group is not for bug reporting and support. The place for support is https://support.mozilla.org/en-US/questions/new/thunderbird. You will want to state that the problem is seen with version 153 or newer, and in Troubleshoot Mode https://support.mozilla.org/en-US/kb/troubleshoot-mode-thunderbird Thanks

Wayne

When Firefox is opened, it reduces the size of the screen! I don't like this and probably selected this without knowing what it was doing. I want to go back to the original full screen! How can I make this happen?

Current Thunderbird setup: Computer: Pop3 Phone IMAP

Until last week, I could leave the emails on my phone all day until I accessed them on the POP3 setup on my computer. That would remove the emails on the server and when I went back to my phone, it would show an empty inbox. Now, the emails do not clear out of my inbox on the phone, and I have to delete them manually. This happens on both the production version and the Beta version. Also, accessing via webmail, the inbox will be empty after accessing email on my computer.

A website added as exception is deleted next time Firefox is used. Cannot find any solution. Can turn off ETP manually via shield symbol in url bar.

Edition Windows 10 Pro Version 22H2 Installed on 30/10/2024 OS Build 19045.6466 157.0 Firefox Release

Hello,

I urgently need technical assistance with a serious issue involving Mozilla Thunderbird and my professional certified email account (Aruba PEC, Italy).

I have been using Thunderbird to manage my professional email correspondence for several years.

I organize processed emails into yearly folders (2024, 2025, 2026, etc.), located under my email account in Thunderbird, not under Local Folders.

Today, October 13, 2026, I discovered that all emails dated January through September 2026 have disappeared from my "2026" folder.

Only emails from October 2026 remain.

The missing messages include professional correspondence, certified email delivery receipts, acceptance receipts, and potentially legally significant communications.

What I have verified so far:

The "2026" folder exists both in Thunderbird and in Aruba Webmail.

Both display the same remaining emails from October.

The Trash folder is empty.

The 2024 and 2025 folders still contain their messages.

Thunderbird's retention settings are configured to "Don't delete any messages."

The "2026" folder inherits the account's retention settings.

I did not knowingly delete or move these messages.

Aruba customer support informed me that they cannot restore the missing emails.

I checked Windows Previous Versions and OneDrive, but no backup was found.

I located the local Thunderbird mailbox file named "2026" in the profile's ImapMail directory. It is approximately 3 MB.

Inspection of a copy of this file did not reveal message headers from before October 2026.

I could not find another larger copy of this mailbox file in the Thunderbird profile.

I occasionally remove unused folders under "Local Folders", but I do not recall deleting any folder containing these messages. The affected "2026" folder is located under the IMAP email account.

My questions are:

Could Thunderbird have deleted or moved these messages automatically despite the retention settings?

Could IMAP synchronization, folder corruption, message filters, or compaction explain this situation?

Are there any additional Thunderbird files, caches, databases, or recovery methods worth investigating?

Is there any way to identify when or how the messages were deleted?

What steps should I take to prevent further data loss?

I have preserved a backup copy of my Thunderbird profile and would prefer not to perform potentially destructive operations.

This is particularly serious because the missing messages are part of my professional and legally relevant correspondence.

Any technical guidance would be greatly appreciated.

Thank you very much for your help.

Quick breakdown: I had my old boss's email loaded in Thunderbird for a short while Didn't want to be invasive after project ended Removed profile from Thunderbird Then Shaw and Rogers Merged - Sold email service too 3rd party Easy-On-Net Easy On Net dropped the ball and all of the historic folders and contents were lost when Shaw/Rogers severed their connection Can I recover up until the point I disconnected his old profile?