Thunderbird Support Forum

I 've used Thunderbird for several years without any issues - thank you for that - but suddenly, over the last two or three weeks when sending a message, I have been getting an authentication error message from my ISP and the e-mail is rejected. This occurs every time I try to send an e-mail after rebooting my PC.

A password change made no difference.

Incoming messages are not affected.

Clearly my ISP is blocking the messages because it is not receiving the correct password or account name - but why?

The workaround I have discovered is to enter troubleshoot mode, then send the e-mail (successfully). Then I can exit troubleshoot mode and any later e-mails are also sent successfully - until I reboot the PC and then I have to repeat the procedure again.

I am using v91.7.0 (32 bit) on a 64 bit PC and running two e-mail addresses, both of which exhibit the same behaviour.

I do not have any add-ons and I use default preferences.

Any help would be appreciated.

v91.7.0 on OS X 10.14.6 Used TB for many many years. Have a Charter IMAP email account set up. All of a sudden a good number of months ago, all my emails in my Inbox have a banner that says "This is a draft message" when just clicking on them in the email list.

> https://i.imgur.com/joLqACp.png

Opening any of those mail (which for some reason always opens as Write: mode, whatever that is, not view or reply; not sure what's going on there either) will show a yellow banner at the bottom of the email with the following: "A unique identity matching the From address was not found. The message will be sent using the current From field and settings from identity <IDENTITY> <MY EMAIL>."

> https://i.imgur.com/svBSvqi.png

Any other folders, like Sent or Saved folders don't show or have this issue. I am not and don't use Unified View. I also have two GMail accounts and neither of them are doing that with their Inboxes.

EDIT: It displays some similarities as the bug here, but not all of them (https://bugzilla.mozilla.org/show_bug.cgi?id=1508153). For example I don't get a double window.

hi, I follow some suggestions as

https://support.mozilla.org/en-US/questions/1309622

and I try to delete mimeTypes.rdf and handlers.json but Thunrderbid continues to use chromium to open https links.

Can you help me?

I am running TB 91.7 in Win 10, with Bitdefender AV and firewall. When attempting to send an email, I received a popup indicating an issue with the SMTP outgoing server. (original message attached) (also original in and outgoing server settings attached). Upon checking the ISP's recommended settings, I discovered some updates (settings attached) and made those to TB (settings attached); I had to do some interpretation here, hopefully correctly. Attempted resend of message, still error messages (two popups attached). The webmail version works fine. Thanks.

This issue shows up randomly, affecting a random number of messages. Issue is that one message will take over other messages following. Message notification will look normal in the inbox, but click on the message following X message, and the X message is what will appear. The subject line at the very top of the page will be from Y, but the rest of the information following will be from X. Two, three or more messages may be affected. Deleting X will make no difference. This time, four messages were affected.

I have Thunderbird set up with several different email accounts. In December 2021, one of the email accounts suddenly stopped working. It won't receive or send emails. I didn't change anything.

I'm not knowledgeable about figuring this stuff out, so I'd be very grateful for some help. The email that's not working is a gmail account. At first I was getting an error message about the password not working. I'm positive I'm using the correct password, because I tried it on https://mail.google.com/ and it worked fine.

I have Windows 10. I updated Thunderbird to 91.8.0 (32-bit) and it didn't make any difference -- I still can't receive or send email from the problem account. I didn't change any server settings (they are the same as my other gmail accounts, except for the specific account names).

When I try to get messages, it says says Connected to pop.gmail.com...

then

connection to pop.gmail.com server timed out

I have no idea what this means or what to do. If you need more information about my settings, just let me know what you need and I'll get it.

Thanks for any help you can offer. At this point I'm desperate.

I've been using Thunderbird for many years and have continued using it successfully since my office changed its e-mail service from serverdata.net to Office 365 several months ago. (Server outlook.office365.com, connection security SSL/TTS, authentication method Normal password.) All was working well as of late on Sat Apr 23. When I next called up T-bird (on my Win 10 laptop) late on Sun Apr 24, I could no longer login to my account. Verified correct e-mail address and password, but multiple attempts to login were all rejected. I could still get in to my account via Outlook at portal.office.com as well as Outlook on my Android, but I can't get in via T-bird....but I hate Outlook and really would prefer to get T-bird working again. On returning to the office the morning of Mon Apr 25, I tried as well with the T-bird installation on my Win 10 desktop (which, again, had long been working fine) and immediately encountered the same problem. So it seems that either there was a silent update to T-bird on Sun Apr 24 which broke T-bird's ability to connect to IMAP on office365.com, or Microsoft did something to the IMAP service on office365.com on Sun Apr 24 which broke T-bird's ability to connect to that service. Yes, I know I could get the Exquilla extension for T-bird and try connecting via the Exchange protocols, but before I do that, it sure would be nice to know whether it's T-bird or office365.com that broke. Anybody else having the same experience? Any solutions figured out yet (other than Exquilla)? Thanks for any insights!

-- Larry Afrin

Every day I notice this message pop up on the status line of TB. It's always the exact same message, compacting saved 1.5GB. Now, I'm pretty sure that I don't actually get 1.5GB of space savings every day, so why does this keep popping up?

My TB is running the current version.

I have two email accounts. On the first one I cannot send or receive emails. I get message "login in to server imap.telstra.com with username *******@bigpond.net.au failed."

On the second I am receiving and sending emails but it is not saving my sent emails.

Any suggestions?

My Thunderbird set-up has worked fine for years so I was surprised to discover two days ago I can no longer send emails. I have a Gmail SMTP account which I have never previously have a problem with.

Thunderbird updates automatically and I am on version 91.8.1 - it's possible the problem began when the new version was downloaded but I don't know when that was.

Whenever I try to send an email I get the error:

The message could not be sent because the connection to Outgoing server (SMTP) smtp.googlemail.com timed out.

Dear community,

in the past, I have noticed that a few e-mails - but not all - are displayed incorrectly as plain text instead of the usual HTML-text. This means that there is no formatting involved, e.g. the font art is not correct. As it seems, the issue occurs when the standard formatting options of e-mails are used by the senders. So if nothing is changed like the font size or colour. If I look at the e-mail on different e-mail programs, everything is alright. I have already ensured that the option View > Message Body As > Original HTML is enabled.

Thanks in advance for your advice. batengo

Hello! Using Thunderbird for some years now and very happy normally. Although after trying to send 1 email with a special character "å" in the address, that did NOT succeed, now everytime Thunderbid launches, it pops a dialogbox:

Dialogbox [Unsent Messages] [X Close] Do you want to send your unsent messages now? [Checkbox, Checked] Always ask me when I go online [Send Now] [Later]

Everytime I launch Thunderbird, it now welcomes me with the dialog box!

I have ZERO messages in [Outbox] folder and [Queue] folders. (Is the latter an official Thunderbid folder?) Both are empty. I have repaired ALL folders. I'm always online.

The email was never sent away, probably due to impossible character in email address, and I never saw the unsent email so I have not been able to delete it. Clicking the [Later] button dismisses the windows but then brings the problem back in the future.

Where is the list of log or index of unsent and still to be sent emails? Apparently Thunderbird knows something, despite [Outbox] folder being completely empty!?

I've manually gone offline and back online and sayed online like normally.

PS. read this topic which did not solve my problem! https://support.mozilla.org/en-US/questions/1072963

Any and all help is welcome. Thanks

All of a sudden when I try to print my emails from my MacBook Air, they come out all garbled like HTML code. Headers and body copy all come out in code instead of formatted correctly. I've tried everything I can think of to try to correct this issue, but I'm out of ideas. It works perfectly fine from both my other desktop computers. It's just happening with my laptop. I NEED to be able to print my emails from my laptop so I have GOT to get this figured out. Please help!

Good day, I am using Thunderbird with my Office 365 e-mail account. I like pretty much the appearance of Thunderbird, as it is not so crowded as Outlook. Unfortunately very frequently it is "Not responding" and the screen freeze for few seconds. Should wait untill returns to normal condition itself, to continue my job. I did not found any topics into help about that problem and any solutions. With Outlook I do not have the problem described above, but prefer to use Thunderbird. Kindly ask you for any advices, if available. Many thanks in advance!

Here's something I've never seen in more than 20 years of using Thunderbird. It's more of an aggravation than anything else, but I'm asking about it because I hope it's not a sign of something more serious:

I receive: "Sending of the message failed. The message could not be sent because the connection to Outgoing server (SMTP) smtp.office365.com timed out. Try again."

But the message does send. This happens mostly with my Hotmail account, but also sometimes with either of my two Gmail accounts.

This started after an update to Thunderbird; one of the v. 91 updates, I think. None of my settings changed and I've done nothing different to the Thunderbird settings in years. I'm running Thunderbird on Xubuntu 20.04, 64 bit, and the current Thunderbird is 91.9.0.

Any thoughts? And thanks for your help.

I am experiencing a problem with the SMTP server rejecting sessions from Thunderbird v91.7.0 running on Fedora 36. Specifically, if I try to forward 2 e-mail messages only 1 message will make it to the SMTP server and actually get forwarded. The error message I receive is

Sending of the message failed. An error occurred while sending mail: Outgoing server (SMTP) error. The server responded: p-impout008.msg.pkvw.co.charter.net cmsmtp too many sessions from 104.33.187.187 AUP#Out-1360.

I researched the problem a bit and there seems to be a Thunderbird solution for IMAP users. However, I am using POP and I haven't found a way to configure a limit on simultaneous SMTP sessions.

This problem occurs because I am using Message Filters to automatically forward messages to another user. I think what happens is that Thunderbird is able to filter multiple messages for forwarding and tries to create multiple simultaneous SMTP sessions.

Not sure if I've done something to cause this, or whats happened or if this is a bug in the beta release I'm using.. 101.0b2 (64-bit)

When I open an email from the inbox view to read it, it always goes into write/edit/reply/send mode(not sure what to call that mode). It's only just started to happen.

Is this a config/settings error I could have caused ? Other Suggestions?

++Mark. https://ctproduced.com

I can not send emails using thunderbird . I have tried to reply to emails, as well as different emails to a variety of recipients I get the following message. Go to https AUP#IPBL1000. I have not gone there, Is this a scam? How do I get back on track?

I'm a long time user of Linux Mint. Now on 20.3 and Cinnamon desktop. Also a long time user of Thunderbird. Now in version 91.8.1 Always used the "allow insecure apps" in my gmail account settings and used normal password stored in Thunderbird. Google urges to change the authentication method to oAuth2. Tried everything to no avail. Always "authentication fails when connecting to imap.gmail.com" Cleared all cookies, allowed them, deleted all saved passwords, followed all published advise I could find, and nothing. Then I made a brand new profile pointing to an empty dir and entered my gmail address and checked everything. Same result. In despair I installed Evolution and all run fine at the first try. Should I really give up on Thunderbird? Thanks in advance for any help!