Thunderbird Community Forum

ever since last update... can't send emails

Send Message Error Sending of the message failed. An error occurred while sending mail. The mail server responded: E5rTxqhwZYbiPE5rUxBTZm DMARC Policy Enforcement: https://postmaster.comcast.net/smtp-error-codes.php#ODM00001. Please check the message and try again.

I'm trying to add an email account to Thunderbird that (seems to) require Oauth2 authentication, but it keeps opening the wrong provider in the Firefox window that it launches. The email account is a professional G-Suite address, but it always opens login.microsoft.com instead.

I've checked the MX record for the domain and it correctly lists Google servers, and my laptop was able to authenticate to the correct destination just fine. I have used my desktop for work before, which is all handled through Microsoft accounts, so I suspect that there's some kind of locally cached data which is identifying O365 as the provider, but I can't find any relevant settings or documentation from Firefox. I also cannot find any settings or controls for the Oauth provider in Thunderbird in order to force a Google workflow.

For years I have been attaching message files, pics., etc. by clicking the Attach button and browsing to the target. Now I have to drag and drop the attachments as the Attach click is useless.

Mozilla Account works normally directly inside Firefox, but logging into Mozilla Accounts through Thunderbird's Add-ons manager fails during the Firefox handoff.

Steps to reproduce: 1. In Thunderbird Add-ons, click Log in. 2. Thunderbird redirects to Firefox, showing "Continue with Mozilla account". 3. Click Continue -> Firefox displays "You could not be logged in. Please try again."

Troubleshooting already tried:

• Created a brand-new Thunderbird profile (thunderbird -P) — same failure occurs.
• Cleared cookies/site data in Thunderbird and cleared Firefox cache.
• Disconnected existing Thunderbird/Add-ons connections from Mozilla Account dashboard.
• Extensions and add-ons themselves install and download normally.

I'm using a mailbox.org account with TB. I'm receiving messages from it, so I'm logged in, but TB keeps asking me every so often to login again, and it has three popups in a row each time. How do I turn this off?

I was adding some filters for senders to move emails to my local folders and such, and then I ran the filters. For whatever reason, when I ran the filters this time, thunderbird also seemingly deleted all emails from some of my web email inboxes. The only one that wasn't affected by this inbox wipe was my school email(gmail provider). How can I prevent this from happening again?

When I send a message the send box does not close. It remains open and says it is saving the message in the sent folder. I then have to quit thunderbird in order to close the box and get back to using thunderbird again. It does save it in the sent folder. but the box remains open Why is it doing this?

Sorry for long post. Struggling to get backup done, running out of time and other things in life now getting really urgent . Got my Yahoo Mail headache again today. Please can someone advise me? Thunderbird 150.0.2, Mac OS 10.15 7 Catalina, 2018 Macbook Pro.

Not tech-savvy so finding it hard to find what settings to use in TB. Other people's post answers always seem to show dialog options I'm not seeing on my computer

AIMS: - Prevent folders from deleting in my backup, if I delete stuff on Yahoo. - Backup Yahoo emails to a stable, local copy on an external drive, so I can access old emails + attachments independently without it trying to reconnect / synch with Yahoo Mail - After backup, delete more mail to reduce YM storage from 39GB to less than 15. Feel reluctant to do this yet, as I already lost a big folder of work from my backup by trying to muddle my way through this. - Ideally would like to end up with a local copy I can access in Mail Backup X What I've tried; - Backup using Mail Backup X. Took 18 hours and some large folders were incomplete so I tried again after splitting them up in Yahoo Mail. I liked the software but something went wrong on the 2nd try and it now won't connect to Yahoo at all. Deleted and replaced 3rd party password multiple times. Server details are accepted, but then the icon just spins endlessly, hence trying Tbird instead. Deleted the MBX account which meant no error logs available (Yes. I should not have done that). - Tried both IMAP and POP backup using TBird - have added TBird ImportExport add-on but have no idea what settings to use, advice welcomed Questions/assumptions that may be wrong: - Was advised to use server export.imap.mail.yahoo.com, what's the reason for this and would it work? Can't remember if Yahoo allowed me to enter this setting. Sorry, hard to recall as I tried so many times. - POP only backs up 1 folder - Inbox. Really?? that's not a solution then - TBird's default is IMAP so surely it would always try and connect to synch, and so would any copied backup accounts? - if I get the ImportExport add-on settings right, can I *really* achieve the goal of a local offline backup I can trust, that I could keep on an external drive and access later via Mail Backup X?

Bonjour, hier j'ai installé Thunderbird sur mon nouveau MacBook, j'ai récupéré tous mes mail, mais en fin de journée, il a disparu. Comment fais-je pour le réinstaller sans avoir à verser un nouveau don ? Par avance merci pour votre aide. Pourriez-vous me joindre au X Cordialement, Catherine

(PII redacted by moderator)

I updated to 155.0.1 via the update modal yesterday, on MacOS Tahoe, and it didn't restart as normal. The main message pane was blank with "No Message Found" (screenshot attached).

I tried installing a fresh 155.0 over, that did not work; but, a restore of the prior app from my Time Machine did work -- that is, the application not the user profile data.

I just thought this was strange; never ran into it.

If there is an issue and I can help test it usefully, I happy to do so (I have backups! LOL).

Forrest

Thunderbird suddenly stopped working properly today, 15 September 2026. Webmail for the same email account is working normally: I can both send and receive messages. However, Thunderbird is having problems with both incoming and outgoing mail. • Thunderbird connects to the IMAP server, sometimes very slowly, but then does not retrieve new messages. • Sending a message from Thunderbird fails because it cannot connect to the outgoing SMTP server. • Thunderbird's own update also fails. This has never happened to me before. • I have restarted Thunderbird and also restarted the Mac, but the problem remains. • I have not changed any Thunderbird account settings. The fact that webmail is working normally makes me wonder whether this is a Thunderbird problem rather than a problem with the email service. Has there been a known Thunderbird problem affecting connections to mail servers or the Thunderbird updater, and could these problems be related

I can no longer get email from my Yahoo email account. I've gone through all the troubleshooting hints and recommendations, as I understand them, but without any luck.

I only have the one account.

The Activity Manager (see attached) shows "No messages to download", but the message at the bottom left said there were messages, but TB doesn't download them.

Sometimes an email I receive contains text whose right margin and text is chopped off. I thought this was because the emails were formatted for Google's gmail, but I just received an email from Thunderbird itself that is truncated this way. What's going on?

I'm enclosing a screen shot. I can also send the .eml file if that's helpful.