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When I try to send I get the following error message:

An error occurred while sending mail. The mail server responded: 5.3.4 554 5.2.0 STOREDRV.Submission.Exception:SendAsDeniedException.MapiExceptionSendAsDenied; Failed to process message due to a permanent exception with message Cannot submit message. 16.55847:69000000, 17.43559:0000000060010000000000000200000000000000, 20.521. Please check the message and try again.

I've tried numerous times. No problem receiving e-mails.

I assumed that the program had become corrupted and so tried to uninstall it through the Control Panel. However it wouldn't uninstall. So I opened Thunderbird in Program Files(x86) Uninstall folder but did not find an uninstall.exe file, only a helper.exe file.

My version is 52.2.1 running under Windows 10

Starting this morning I suddenly cant delete or mark emails as read in Outlook.live.com. Even if I open an email, and it appears as read after that, if I refresh or leave the page and come back, its marked as read again.

I tried dropping all add-ons (a kill switch to drop all add-ons and re-activate them is still a feature I feel Firefox needs, I have to click every single one of them every time) to no avail.

I was in the process of writing this question on the Microsoft forums (which is usually like whizzing in the wind) when I thought to try a different browser. I had zero issues and Outlook.live.com worked perfectly normal on Microsoft Edge.

This HAS to be a bug in a recent update in Firefox

Hello. I am not familiar with this end to end encryption that Facebook now does for Messenger but now when I try to use Video Calling/Chat it tells me it is not supported by my browser, Firefox. I have never had any problems with it before. Is there a fix? Thanks

106.0.2 locks up Windows Explorer (Not Responding) on my Win 7 machine as soon as it starts. After restarting Explorer, it seems to continue working. I have seen this issue reported earlier.

I have a hotmail.com address. Until recently, it worked well as webmail, plus also from TB on laptop, via IMAP and SMTP.

A few days ago, the sending function via SMTP stopped working (not IMAP); and webmail is still fine. I've tried a lot to solve it, but to no avail.

My guess is that MS is to blame, but don't know how to reach someone better-than-hotline there.

Details see annex; OS is Win10, TB is 115.9

Would someone be familiar with this kind of problem? According to my traditional european quality idea, best should be to get in touch with an MS technician with access to the syslog, to hear what the system's response to connection attempts is - but this seems to be precluded? I wonder what alternatives there might be?

I'll be staying with a friend whose ISP is Spectrum. Spectrum claims they have no idea what settings I need to change in Thunderbird in order to go through them to get to my ISP's mail servers. I'm assuming that there ARE settings that have to be changed because a few years ago, when staying with different friends in NY, I had to call their ISP (Verizon) to find out what needed to be changed in Outlook Express' settings. I no longer recall which ones.

I think that this problem arose only with the most recent update to Thunderbird, which I installed yesterday or today (April 22). When I hit the Enter key Thunderbird automatically doublespaces, which is fine for text as it separates paragraphs. However, I also will sometimes type my name, address, and telephone number at the end of the message, using Enter for each to line, and I cannot find a way to make Thunderbird singlespace at that time. Word processors usually have a "line" option that allows for this (at least WordPerfect, which is still the best word processor, does). I'd much rather have Enter do only a single space; I can always hit it twice to double space between paragraphs (I've been doing that since I first used an electric rather than manual typewriter).

When trying to click on links inside PDFs, the url is changed to undefined, producing an error message. For example, a Hostgator article is converted from https://hostgator.com/help/article/how-do-i-change-my-dns-or-name-servers to https://undefined/help/article/how-do-i-change-my-dns-or-name-servers

I have tried clearing the cache, troubleshooting, and get the same result in safe mode, and reverting back to Firefox default settings. And I still get the same result. I've attached an image of the error message.

I am using TB 31.7.0 on a MacBook Pro running the latest version of Yosemite. I use BusyCal as my calendar software (although I think that is not relevant to the problem I am experiencing).

When people send me an email with an ICS meeting invitation attached, the attachment does not arrive. I get the email but there is no attachment. So I always have to send a reply and ask them to manually type the meeting details into an email, and then send it to me. It appears that this problem occurs when meeting invitations are generated with Outlook. (That's a guess on my part.)

I've read through the forums to try to find a solution to this problem, and I haven't been able to find it.

Any suggestions?

After updating thunderbird a little week ago maybe - the program began to shut down suddenly - several times. But today there is no acces to mails, folders.. just an almost blank screen. Only the 'headers' are visibly - you 'Files', 'Edit' etc. is visbly. I'm an old Danish women with very little knowledge of reading and understanding complicated possible solutions - but I know how to install a program, so how can I find an older version to install, so that I can read and write an email again?

Now I have to use and old gmail-account and not my usual accounts.

I'm so sad...

Thunderbird will not connect to my bt mail. I have tried Mailbird, Outlook and others and they will not connect. I have checked configuration with BT and they say all OK. Have changed password - no change. Manually configured with password - no change. My PC has had a new SSD since and still will not connect. I have Broadband with BT so I get the same privaligies as Premium. I have malwarebytes and that allows them to connect. Up until a couple of weeks ago it worked OK and then suddenly it stopped working. Had my local Techie shop look at it - no result. They said it must be BT, but spoke to them again today and they say it should work - certainly with outlook. They recognise connection, but says either config or password incorrect. Changed password again, but no change. Can you please tell me where the problems is. Thanks

From the article "Microsoft OAuth Authentication and Thunderbird in 2024" there is a screenshot showing a OAuth2 option for the SMTP server setting with STARTTLS connection security. It does not appear for me. There are only the five options, as shown in the screenshot. How do enable the option to be available in the drop-down list or set it?

The available options are:

No Authentication Normal Password Encrypted Password Kerberos / GSSAPI NTLM

I am on Thunderbird version 115.12.1 (64-bit), Windows 11, version 23H2, build 22631.3737

I have Thunderbird Version 45.8.0 where after composing a message when I click Send, the message disappears nicely from the screen and the message is off.

However on the latest version 52.1.1 (32-bit) when I do the same action, Click to Send.. the message stays on the screen for a while and I have to wait for it to disappear before I can do something else.

Is this a case of different versions or is there a tweak in the new version that I can set up in order for the Send function to behave the same way as the older version?

It is getting quite annoying sitting and looking at the screen for the message to disappear after clicking Send.

Thank you for your help.

Two issues using latest version of Firefox with Windows 10.

These 2 issues have occurred in the last few days

First I cannot attach my files to my emails using Gmail. I'm able to do this using Edge or Chrome

Second, normally when I used to start typing the name of my correspondent it would automatically complete. This is no longer working. I'm able to do this using Edge or Chrome

the attached printscreen shows both issues

After switching to Firefox version 123, I encountered an error on our website: '1,000,000.00 is not a valid number.' It seems to be a form validation error, but it worked fine with previous versions of Firefox. The application is built using GWT (Google Web Toolkit). Any help would be appreciated. Thanks.

What Happened To The PASTE Option, When You Are Composing A New Email In Outlook  ?

If You Copy Something, Then Right Click In The Message Section Of The Email, You Do Not Get The Drop Down Menu With PASTE As An Option.

You Only Get The PASTE Option When You Right Click Into The SUBJECT Line.

Can receive but unable to send emails - SMTP - AUP#out-1500 Thunderbird version 115.4.1 Windows 11 Windows Defender Spectrum provider - Can send messages when I go to Spectrum site on internet Copies of account settings attached

On chrome I have several profiles and different ones use different LastPass (and other) extension services. EVERY PROFILE maintains it's OWN login information.

Firefox, however, does NOT ISOLATE PROFILES. On ANY Firefox profile, if I log into LastPass EVERY PROFILE is forced to use THAT information- even going as far as logging out and logging into the OTHER profile's information/account. This is 1990's level idiotic.

WHY are profiles SHARING LOGIN INFORMATION!? This is entirely stupid and defeats the entire purpose of multiple profiles.

I had this happen with Facebook logins, too... WHY does ONE profile FORCE OTHER profiles to change their login information?! WHY ARE THEY NOT SEPARATED?!

How do I solve this?!

it is the SINGLE biggest reason why I can NOT switch to Firefox again. Chrome does this. Chromium does it. EVERY Chromium browser does this. 10 years ago Firefox did this... and I left it when it QUIT doing this... when it BROKE profile separation.

Why is this STILL a problem?!

Dear Everyone, Facing issue with deploying Configuration Profile for Extension Settings via Intune. Tried ADMX imported template with adding there "block all extensions" and allow certain ones. Worked perfect in Jamf, for Intune failing all time. We are using Firefox v.121, policies are for v.120, but I am in doubt that this is the issue. Can someone review and let me know if there any issue or may be changes? Using latest instructions https://mozilla.github.io/policy-templates/#extensionsettings Also here is my OMA, very easy.

OMA used ./Device/Vendor/MSFT/Policy/Config/Firefox~Policy~firefox~Extensions/ExtensionSettings

Value(string):

<enabled/> <data id="ExtensionSettings" value=' {

 "*": {
   "blocked_install_message": "Security Test",
   "installation_mode": "blocked",
   "allowed_types": ["extension"]
 },
 "{bf855ead-d7c3-4c7b-9f88-9a7e75c0efdf}": {
   "installation_mode": "force_installed",
   "install_url": "https://addons.mozilla.org/firefox/downloads/latest/zoom-new-scheduler/latest.xpi"
 },
   "@react-devtools": {
   "installation_mode": "allowed"
 }

}'/>