Thunderbird Community Forum

I have now the version 158.01 (64-bit) with Windows 11. My Gmail account only dowloads email like once a day. The server settings are: -Check for new messages at startup -Check for new messages every 10 minutes This started a few days ago, while I had the version 158.00. I have many accounts on Thunderbird, and re-installing all of them would be time consuming. Any suggestion?

After a lot of research, I thought I had the filter issue conquered. I perhaps made them too complicated, using several "match any of the following" by using the plus sign and entering into the second window which appears. I used "match any of the following" For "from" I chose "from, subject, cc". After creating a zillion of them, I wanted to edit one or more and when I click "edit" I get: "This filter was probably created by a newer or incompatible version of Thunderbird. You cannot enable this filter because we don’t know how to apply it." Using 151.0 (64-bit) Thanks....

Hello New to TB, it's working well. My question is that I can't find a setting that causes emails to be downloaded immediately from the server as soon as they are received. Is there one?

The only available settings I can find are

Check for new messages at startup Check for new messages every (minimum 1 minute) Allow immediate server notifications when new messages arrive

If I have all of these checked then I should get an immediate sound and/or visual notification when a new message arrives on the server and I can see its header, so what is the significance of the "check for new messages every (set to 1 minute)" setting? Does that mean it will download all messages, including bodies, received in the last minute without any user input?

Upon startup Thunderbird downloads multiple copies of every email. A few days ago it was just 5 copies of each now it is 10 or 15 copies of each. Of course it then gives the disk full message. But this drive has over one Terabite of free space.' Been a user since Thunderbird inception and donated a few times but this and other iss are making it hard to stay loyal.

I've received the following message the last few days when I send an email with Thunderbird:

Your message was sent but a copy was not placed in your sent folder (Sent) due to network or file access errors. (I am sure neither of those errors apply.)

It then gave me the option to "save" (I didn't get the exact wording before I clicked on "save") and I don't see it anywhere. This was a very important email and I need to find it.

I believe this is because Plusnet are transferring me to Greenby, and I am now required to sign in using my full email address, i.e. ***@madasafish.com. I can't figure out how to change this, it will only let me change my password. Please can anyone help -urgently!

For years I have had two email addresses: - @virginmedia.com and an older @blueyonder.co.uk one - with no problems: POP is set up with the two servers pop3.virginmedia.com and pop3.blueyonder.co.uk. SMTP is set up with smtp.virginmedia.com for both. Everything was sweetness and light. I could receive and send from both accounts no problems.

Two weeks ago, the MF-505 relay refused error popped up when I tried to send an email from @blueyonder.co.uk and has continued to do so ever since. I can receive @blueyonder.co.uk emails with no problems. I can receive and send from @virginmedia.com with no problems. I can login to the virginmedia webmail site with @blueyonder.co.uk and send emails with no problems. Even so, I changed the @blueyonder.co.uk mail app password with Virginmedia just in case; no help. I have deleted the saved passwords and resaved them; no help. I have tried adding an @blueyonder.co.uk smtp outgoing server to Thunderbird even though I never had to before; no help. I have checked smtp server outgoing settings - even though everything works fine for @virginmedia.com. No problems there.

The general advice "out there" seems to be wait and it will resolve itself but it's been two weeks and for what it's worth Virginmedia confirm there is no problems with my account or their services their end.

any suggestions will be appreciated.

I used compuserve.com for email since more than 20 years ago when the internet is accessed by dialling in. However, compuserve.com is absorbed into AOL quite a number of years ago, and since then I have difficulty in reading my email via Mozilla Thunderbird. I need to login my compuserve.com account via the AOL website, and the mail files cannot be download to my computer for storage. I noticed in the web at the time that compuserve.com account users are complaining about the difficultly of getting the email via other email readers as well Is Mozilla Thunderbird has an update that can read the emails account in AOL or compuserve.com? My computer is using window 10, Version of Mozilla Thunderbird  : 102,0,3

Many thanks

Good Day,

When sending email to a list in my address book, I get the error stating that its not a valid email address and to verify it is in the User@Host format. However, if I right click on the list name and choose EXPAND LIST and it then correctly displays all the email addresses and names, and it sends completely fine and without issue ?

Any ideas have to fix that issue ? Thank you in advance for your assistance.

I use Thunderbird with a info@... account hosted by TransIP.

When I send an email, especially when I reply to a previous email and even more when this was my own email, the sent email is not always saved in the Sent folder: neither in the webmail of TransIP nor in Thunderbird. It seems random when emails are and are not saved in the Sent folder.

The replies are sent through; the recipient receives them.

What can I do?

I had Thunderbird installed on my Windows 10 computer and on my Android tablet. I noticed that some emails were not going. After hours reading posts on the internet I changed from POP3 to IMAP. Now nothing works. I uninstalled Thunderbird from both my laptop and the tablet and then did a download and reinstall on each. In each case I could receive email but now could not send. In the end I am uninstalled from both devices and loaded another product called EMclient. It installed instantly and properly on both the laptop and the tablet. I would like to return to Thunderbird, in spite of the fact that I lost a lot of emails in folders from a number of years of using the product, but would certainly like a lot simpler installation than what I experienced. Mozilla needs to look at other products and determine why they install so easily and Thunderbird is so difficult. I can't provide the version of Thunderbird other than the version for the laptop was the latest from mozilla's website and the version for the tablet was downloaded from the Play store in both cases this evening.

As of Oct 12 2026 I also have this issue. About a week before the 12th I was getting messages that I needed to sign into my RCN account which I would do and it just kept asking me. A few times each night to start then right before it shut me out I had over 50 of these messages just flooding my screen. I never did get a screen shot of that message, but did for the 2 error messages I got later once it shut me out.

I shut down my computer the night of the 11th then when I signed back in on the 12th I could not send or recieve any emails. SOmething similar had happened before, but when I shut down again it went away. This time it did not. I then tried to access my emails thru the webmail I can access, but that also had shut me out. I also tried my tablet, a borrowed smart phone, but I could not access anything for my emails. I troubleshooted with my email company and my internet company, but they found nothing.

Then I shut off the wi-fi on the smart phone and bin go I could access the webmail. But I still cannot find anything on what to do to fix this.

I use RCN for my email, Spectrum for my internet. It is a POP3. Running Thunderbird version 153.5 Oesr (32 bit) Meadow, which says it is up to date. I have norton 360 anti virus & do not use VPN. I disabled my Auto-protect and firewall on the Norton and that did not change anything.

I have sent the error messages to RCN and also troubleshot with Microsoft and had some hints, but nothing has come of that yet. Here are the screen shots of the only 2 things I ould capture. The error message was when I was trying to access my email thru Thunderbird. And it came up every time I tried to send messages, not that does not show up anymore and nothing happens when I try and send anything. The second one was when I was trying to access the RCN webmail and it would not let me in on anything I used. Until I shout off the WI-Fi. Then the smart phone could access my webmail account.

So long as I investigated, the problem is,

After version154, received emails in Japanese encoded by 8bit causes misconversion (mojibake). Emails encoded by base64 is not misconverted. Only 8bit encoded shows the problem. Version153.5 is no problem. Version154 and newer shows the problem.

Here are OK/NG by sender/receiver combination. Sender version154 8bit - receiver version154 - NG Sender version154 base64 - receiver version154 - OK Sender version154 8bit - receiver version153 - OK Sender version154 base64 - receiver version153 - OK Sender version153 8bit - receiver version154 - OK Sender version153 base64 - receiver version154 - OK

Emails encoded by base64 is OK, but some senders can encode by only 8bit. I cannot find how they can use base64. It would be helpful to know to use base64 encoding in version154 (or later).

However, the best way is that version154 (or later) can read 8bit encoded email in Japanese. I would like to thank anyone who help the problem.

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

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.

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.

I have now the version 158.01 (64-bit) with Windows 11. My Gmail account has stopped sending emails. This started a few days ago, while I had the version 158.00. The error message is that connection to the outgoing server smtp.gmail.com times out. With the help of AI, I have created a test profile, and it sends mail, though it is a bit slow in saving them to the Sent folder. With the help of the AI, I have tried maybe 30 things to troubleshoot, but none worked. I have many accounts on Thunderbird, and re-installing all of them would be time consuming. Any suggestion?