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I upgraded my Fedora nad I think that Thunderbird 149 came with that upgrade. I cannot send mails. Ctrl+enter has no reaction. Downgraded to 148 and everyhing is fine. |<

I've got a new phone after the last one went missing. I tried to put my usual Virgin Media email onto Thunderbird and get 'authentication failed' I've checked the server name, port and connection security match those on my desktop. Grateful for suggestions thanks

Summary: Thunderbird intermittently fails to download certain POP emails that are visible in Mailwasher Pro. Some messages download normally, others disappear from Mailwasher (as expected after a successful POP retrieval) but never appear in Thunderbird. No error messages are shown. Environment: • Email client: Thunderbird (current version) • Account type: POP3 • Anti spam tool: Mailwasher Pro • OS: Windows 10/11 • Mailwasher behaviour: Messages appear correctly in MW’s inbox list. • Thunderbird behaviour: Using Get Messages retrieves some emails, but others vanish from MW without being written into Thunderbird’s Inbox. Detailed Behaviour: 7. Mailwasher shows new incoming messages normally. 8. When Thunderbird performs a POP “Get Messages”: • Some messages download correctly into Thunderbird’s Inbox and disappear from MW (expected). • Other messages disappear from MW (as if retrieved) but do not appear in Thunderbird. 9. These “evaporated” messages are not: • In Inbox • In Junk • In Trash • In Local Folders • In any filter redirected folder 10. No error dialog appears in Thunderbird. 11. Mailwasher logs show the messages were handed off to the mail client (this by omission). 12. The issue has become more frequent recently. Suspected Areas: • Thunderbird POP retrieval logic intermittently failing to write messages to Inbox. • Possible interaction between MW’s “hand off to mail client” and Thunderbird’s POP session. • Potential profile corruption or POP state file corruption (popstate.dat). • Possible Thunderbird bug affecting selective message retrieval. Assistance Requested: • How to diagnose POP retrieval failures where messages vanish from MW but do not appear in Thunderbird. • Whether Thunderbird logs can show POP level message acceptance or rejection. • Whether popstate.dat or Inbox file corruption could cause selective message loss. • Recommended steps to isolate MW interaction vs Thunderbird internal handling.

I use Thunderbird all the time as my email on a desktop PC.

For several emails, especially some from yesterday the Correspondent and the subject have  ?crossed?

For example: an email looked from the Correspondent list as if sent from my energy provider but the message was from a Garden Centre. It's not a one-off; another message looked like from a magazine but was a receipt for a purchase. They were not consecutive so it's not as if the list has 'slipped' by one or two. I think it's happened before but not as worrysome.

Is there a reason or solution please?

I'm now scared to delete unwanted emails without time consuming checking each one in detail.

Thank you for any advice/support/suggestions

I have a Gmail account. I use a Duck Duck email address as my main email & forward to my Gmail. Can.i assume Thunderbird will download all Duck Duck emails as long as they're forwarded to the Gmail account?

Hi, In installed thunderbird on my mobile device and manage different email-accounts. Whenever I open an incoming email for account "A", I am in "answer"mode. For account "B" everything is normal. I don't see any different setting for those 2 accounts. Does anyone has also this effect and any idea how to solve this?

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.

Hi Today, several emails that I have received, which I think were sent from an Outlook account, have, instead of what I would expect to see as the sender's address under correspondents, have Microsoft account team <account-security-noreply@accountprotection.microsoft.com> When I click on the email, I can see the genuine sender's address This has only happened today At least one of the emails that I received came from someone that I know uses Outlook Any ideas? Thanks

My TB installation got corrupted due to a hardware/disk issue. On restoring it from backup TB keeps trying to download all messages again. I know this is something to do with the popstate.dat file but I can't seem to stop it. What do I need to do?

Also, I had never noticed this before (because I never looked at the TB file system) but TB created multiple folders for the email account.pop.mail.yahoo-1.com up to pop.mail.yaho-4.com. Why does it do this and is there a way to get back to just one file? Is this something to do with TB crashing or what?

Is it using all of these files or just the latest and how do I know? All of these folders have a popstat.dat file and one has multiple following the popstat-1.dat etc.

I've no idea how to recover from this. Any help would be much appreciated.

hello, i set up my microsoft 365 / outlook account in thunderbid using oauth2 and smtp (port 587, starttls). however outgoing emails fail to send. how can i resolve this smtp issue

Yes, this outlook account was made earlier this year. I've tried all of the "fixes" offered on here and across the internet. I'm changed to to password and got the app password. I've deleted 2FA to see if that would work. I've deleted the Oauth key and it refreshed to a new one. I've done it all and TB-sync is not available to me cus apparently now i'm right outside the app version limit.... how convenient. It's very frustrating as i really like the app and still use it to read my emails but it's very annoying to have to open the outlook app and go through all that just to send an email. I keep getting told it is possible, i've been battling this on and off for months. I cant just get a new email either as i already swapped everything to the outlook one and my work using out look as well. i am able to sync my calendar even but apparently just not my outgoing emails. I would like to transfer my email but the other email i have is a proton email and they are a whole other headache. Please help.

OS: Linux / Android

TB Version: 156.0

Current Outgoing Server Setup:

Server Name: smtp-mail.outlook.com Port: 587 Connection Security: STARTTLS Auth Method: OAuth2 Username: *****@outlook.com

Having issues sending e-mails due to message: "e-mail not sent. Cannot connect to SMTP server 47.43.26.4 (47.43.26.4:587) connect error 10060" Requires 2-6 attempts to send. Also, problems with sending attached files, claiming to be too large.

Mozilla Thunderbird installed on new WINDOWS 11 laptop in May 2026 as an email client for BT MAIL. It has continued to function without issue until early September. At which point it became an issue with sending emails difficult and mostly impossible. When sending I have been prompted to enter my account password, sometimes this would be accepted, but often not as the outgoing email would fail to be sent. The reason given that Thunderbird could not connect to the outgoing BT MAIL SMTP server, even though none of these settings had been changed since installation using IMAP. However a connection test is always a positive result and a certificate is provided. As I write today i have been able to send and/or FWD a few emails, but have no confidence that this will be the case going forward. Last week I made a one off donation to Thunderbird and after rebooting the laptop, I was able to send messages, but only for that day ! The sending issue reappeared the next day.

I have been told by OZ lotteries that my emails are being soft bounced with the error "Email is not delivered because the mailbox is full or for other reasons". They suggested my email inbox is Full but that's not the case. Any suggestions as how I can fix this please?

One day after windows update, my thunderbird can't not download email from yahoo, microsoft, google..etc I tested the connection be fine but I can't recive any email

I have a BT Internet email account configured in Thunderbird using IMAP.

I'm experiencing a problem where some emails in the message list have no Correspondent/sender or Subject, and sometimes the displayed time is incorrect.

For example, a message-list entry showed 12:55, but when I opened it, the actual email was from 8 September. The email body itself was present and correct.

My Inbox contains approximately 7,782 messages and took several days to synchronise. I also have numerous archive folders.

I have already:

Checked the BT IMAP settings — mail.btinternet.com, port 993, SSL/TLS. Allowed the entire Inbox to finish synchronising. Used Repair Folder on the Inbox. Restarted Thunderbird. Restarted Windows. Changed the message list from Cards View to Table View.

The problem persists.

Importantly, the same BT mailbox displays correctly in both the BT Mail app and iOS Mail.

I also experienced a very similar problem previously in New Outlook: some newly received BT emails appeared as [Unknown] with (No subject). Removing and re-adding the BT IMAP account and repairing/resetting New Outlook did not resolve it.

Thunderbird is therefore the second desktop IMAP client in which I've experienced this type of problem, while BT's own mail app and iOS Mail display the messages correctly.

I don't want to create a new Thunderbird profile because the existing profile contains thousands of emails and took several days to synchronise.

Could this be an IMAP synchronisation/message-header/indexing issue between Thunderbird and BT Mail?

I can provide screenshots and any Thunderbird diagnostic information you need.

I am not able to send emails the last couple days. Any ideas on how to fix this? My incoming mail works fine, but when I try to send and email, reply or forward, it will not send.

Thanks!