I-Thunderbird Community Forum

Thunderbird 156 wanted to keep getting a response that my business associate's email account did not exist. I had to have the recipient contact me to get Thunderbird to successfully deliver the email I first sent and responded to. Is this not some Java bug to the domain?

My T-bird is not receiving incoming messages in one E-mail account. How can I add back an IMAP server on an existing T-bird account after T-bird deleted the line with the saved password and IMAP server for that account? I tried to change the IMAP server address for an existing T-bird account, but T-bird and/or my ISP deleted the saved password and IMAP server line for that account in T-bird's Saved Passwords table, so T-bird cannot get incoming E-mails. The IMAP server address still exists in T-bird's Tools -> Account Settings -> Server Settings page, but NOT in the Tools -> Options -> Privacy & Security -> Passwords -> Saved Passwords table. I would like to add an/the IMAP server back to the account without deleting the account, and re-entering all of its settings again. I have not figured out how to do this.

How can I change an IMAP server on an existing T-bird account after T-bird deleted the saved password and IMAP server for that account? I tried to change the IMAP server address for an existing T-bird account, but T-bird and/or my ISP deleted the saved password and IMAP server entry for that account, so T-bird cannot get incoming E-mails. I would like to add an/the IMAP server back to the account without deleting the account, adding all of its settings again, and waiting 6 hours for T-bird to re-download all of the most recent 10,000 messages in the Inbox and all of the 15,000 messages in other folders again. The SMTP server and its saved password are still in the Saved Passwords table.

In TB prior to v.155, folder message counts were not shown at all if the respective folders were empty. That is, instead of showing "0", TB did not show anything.

Now, after updating to TB v.155.0.1, I see dashes (horizontal lines) in the folder tree to the right of each empty folder.

Is it possible to revert back to the original behaviour and get rid of those unsightly dashes? They only add visual clutter (my opinion, obviously) while not providing any extra information.

Thanks.

I have been using Thunderbird for a while.. I could always filter messages easily to help with mailbox cleanup, now it seems to have stopped working or a setting has automatically changed.. When activating Quick Filter, I could type in the 'Filter Messages' box and it would start listing the mails in that inbox as I typed, now it doesn't happen anymore..

I downloaded the version on the site but I can't get it to accept my password all I get each time is this at the top of the box

Component returned failure code: 0x804b000a (NS_ERROR_MALFORMED_URI) [nsIIOService.newURI]

Just how am I supposed to understand what that means. I would be grateful for any help you can give I've been using Thunderbird for over 25 years without any problems, I had to reinstall Windows and now I've got this problem.

I can not create a new email account for the email : info@ecomtehpro.ro. I have already an email account: office@ecomtehpro.ro. Please give me a solution to create the new email account. Thank you.

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

Anyone know how to use the new setting "mail.addr_book.add_item_default_uri" in 155? The default value is a URI, "jsaddrbook://abook.sqlite", how do I figure out the URI of an alternative? I want to point it to my CardDAV server, do I just set it to the CardDAV URL?

I choose to use POP not IMAP. Yesterday morning, messages downloaded as normal, no problem. Yesterday afternoon, they did not download and I received this message "Unable to write the email to the mailbox. Make sure the file system allows you write privileges, and you have enough disk space to copy the mailbox." I had done nothing at all to my system in the meanwhile, as far as I am aware. I have tried deleting a lot of old emails from my inbox, and emptying the 'Deleted' folder. Any suggestions very welcome.

I am trying to migrate from Microsoft Outlook 2021 to Mozilla Thunderbird. I have successfully imported the email from a number of different email accounts. I would now like to import the archived emails held in a number of PST files. The import tool would seem to be what is required, but it does not seem to allow me to select the PST files that I wish to import. I am concerned that it will try to import all email messages from my Outlook 2021. Is there a way of restricting it to just individual PST files?

Running Win10, all the sudden I'm getting Not Responding messages, failures to connect to server, and slow deleting of emails. I tried everything: uninstalling/reinstalling; running on troubleshooting mode; checking compatibility. Nothing works. Any ideas?

Thank you

For years I have been using Thunderbird and supporting with donations and one of the important uses is being able to preview .pdf files and then quickly highlight and copy information from the pdf such as an invoice number so I can paste it into another document.

Now I can not do this - Why?

I am running 154.0 (64-bit) on Windows 11 - not that this should matter - clearly the issue is the update has chanced how .pdf's can be accessed.

Other issue is printing the pdf only prints a blank page

Incredibly frustrating - what is the issue and how do I fix it?

I have 2 email accounts accessed by thunderbird, after the last update it appears that the secondary account is sending the incoming messages directly to the trash folder can you look into this or can I revert to the previous version?

This problem has not been resolved but continues. Please tell me in plain English what I can do to correct it, other than to abandon Thunderbird.

Using Mac Airbook iOS 15.6.1 Sequoia

This past Saturday (21st) I noticed it was taking longer to get emails from Spectrum. I had to click the Get Messages button several times and eventually the box to put in my password would pop up. After putting it in the emails would finally show up. This continued into Sunday, but by late afternoon I was getting no emails from Spectrum. I tried sending a test email from Thunderbird and got the following error message:

An error occurred while sending mail: Outgoing server (SMTP) error. The server responded: impout007.msg.chrl.nc.charter.net cmsmtp [my IP address] blocked. Please see https://www.spectrum.net/support/internet/understanding-email-error-codes for more information. AUP#Out-1120.

I went to the Spectrum website to look up the error message and found this:

The IP address you’re trying to connect from has an issue with the Domain Name System (DNS). Spectrum requires a full circle DNS for emails to be allowed through. Verify the IP you’re connecting from, and check the IP address to ensure a reverse DNS entry exists for the IP.

At that point I called Spectrum tech support, spent about 2 hours talking to 3 different people, but I got no solution. I was able to verify my IP address is not blocked. I was basically told everything is fine on their end, so I should contact Thunderbird. All of my emails are still on the Spectrum website. I can send and receive on that site. No changes have been made to account settings or my password. I’ve tried to find an answer using Google and Youtube, but nothing so far. I did look on the Thunderbird forum, found a post from someone who was also having trouble with their emails and Spectrum this weekend. I’ve downloaded the latest version of Thunderbird, 153.1. One of the tech people suggested I use the Repair tool in Thunderbird on one of my folders. I wish I hadn’t. I used it on the Inbox folder and all of my emails disappeared in Thunderbird. They’re still on Spectrum’s site. If anyone has an idea for a solution I’d appreciate it.

As I was about to post this I opened Thunderbird and about half of the emails from my In Box have reappeared.

After latest update Thunderbird cant send or receive emails. My settings are correct mail.charter.net port 993 outgoing mail.charter.net port 587.

Tells me I have a server error and is constantly asking for my password. HELP!!! I have been with Thunderbird since the beginning and have sent money to the cause, and now I need your help.

Thanks, Pam