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Hello,

Recently I have started to have emails fail to deliver to a certain domain and the message that comes back is

550 DKIM Sender Invalid - envelope rejected.

I am using Thunderbird v128.8.1 esr (64-bit). Extensions installed are: 1. Attachment Saver (Deimios, v.0.2.2) 2. FileLink provider for Send (Teal Dulcet v2.1.1) 3. Remove Duplicate Messages (Eyal Rozenberg v0.6.1)

I have been in communication with this client for several years and not had this problem before. When I send email to the same recipients using WebMail there is no problem, it is only when I send from Thunderbird.

I am not using any encryption type of setup.

Has anyone come across this before? Does anyone know of a solution?

Thanks, Franc.

Recently, T'bird has been labelling all emails sent from my account as coming from my wife's account. My bank ignores me because the emails aren't coming from the registered address. I haven't (knowingly) changed any settings, but I'm temporarily using a laptop which has a mind of its own! Any suggestions for a fix?

URGENT: Unable to Create Inbox Subfolder – “An unexpected error occurred”

Message:

Hello Thunderbird Support Team,

I'm experiencing a serious and blocking issue with Thunderbird after attempting to import a backup of my emails.

Whenever I try to create a subfolder under the "Inbox", I receive the following error:

swift Copiar código Error: An unexpected error occurred Failed to create subfolder: Inbox normalizeError@resource://gre/modules/ExtensionCommon.sys.mjs:875:12 wrapPromise/</<@resource://gre/modules/ExtensionCommon.sys.mjs:1025:23 This issue is preventing any proper folder management or import activity. It appears to be related to the newer Thunderbird builds (possibly version 128.x), and I suspect it may be linked to spam/junk folder configurations or internal handling of folder URIs. </p>

This is highly disruptive for daily operations, and I urgently need a fix or workaround.

Could you please advise on how to resolve this, or confirm if this is a known issue that will be addressed in an upcoming update?

Looking forward to your prompt help.

Thanks in advance, ALEX FORTUNATO

Currently switching to Thunderbird from MS LiveMail. Found out, that Thunderbird does not search in attachments. This function is present in MS LM and is regularly used. Is there any solution for Thunderbird? Thank you.

I have set up two e-mail accounts, both GMail. I often need to transfer e-mail from one account to another within the client. Transferring messages from one account to another goes smoothly when they do not have attachments or when the attachment is less than 5MB in size When the message I move contains attachments weighing more than 5MB, Thunderbird crashes and the transfer does not happen. The only solution found, which I would like to avoid, is to download the message with a ‘'save as,’' then drag the .eml file to the right folder in the different account. I have checked and Google does not block the transfer nor are there any problems with quotas (I am a Google Wokspace administrator). Google support confirms to me that there are no blocks and that the operation should go smoothly. They suggest that I contact Thunderbird support. Is there a procedure or setting in the program that allows messages to be transferred smoothly from one account to another even when they contain attachments? Thank you

I tried to drag some old emails from one folder to another. In the process, they seemed to disappear. They are neither in the original folder nor in the destination folder.

I presume they must be somewhere in my system. Can you advise how I can search for them. I have tried using the senders' names but with no luck.

Thank you very much!

I downloaded the free version of mailsdaddy and converted my old outlook emails from pst to mbox. My problem is that no matter which variation of import I use through the Thunderbird Tools/Import menu, I get a message that the import failed and more info may be available in the Error Console (wherever that is). Can you tell what I'm doing wrong. Thank you!

Last weekend I had to verify a third party account via my Thunderbird email address. I tried six times and didn't receive an email. This was ridiculous. It had never happened previously. I double checked my back up Gmail account and the emails weren't there either which clearly demonstrated that I hadn't received them.

I spoke to the company today who could only keep reiterating that they'd been sent and they could "see" they had been received. The fact that nothing appeared in my Gmail account either meant nothing and the fact that this had never happened with Thunderbird previously also meant nothing. I was told in no uncertain terms that the problem was at my end.

The most annoying part is that for every other thing they use my Thunderbird email address without any problem so having been told that the problem was my end they had no answer as to why some emails arrived and some did not.

I was asked to contact Support to see if for some reason they'd been blocked.

Advice would be much appreciated.

Hi

My problem is I don't receive a notification when my email is read. I tried both "Return receipt" and "Delivery Status Notification" Enabled but still I don't receive any notifications when my emails get read

Dear users,

I installed thunderbird on my pc only to open .mbox files containing archives from past years.

I read in the guide I need to add a plugin called ImportExport NG to open mbox files, but first I have to see the "local folders", which doesn't exist.

I attached the screenshot of thunderbird just installed on my pc and launched. I miss the "local folders".

How can I fix?

Thanks

I converted to Thunderbird 128,11.1esr in May 2025. My address book did not migrate to the newer version and I don't have the old one. Also, I don't know how to return to the previous version of Thunderbird.

I am getting the following notification: Your message was sent but a copy was not placed in your sent folder (Sent) due to network or file access errors. You can retry or save the message locally to Local Folders/Sent-[email]@earthlink.net. What is happening? How can I get back to normal?

I am trying to whitelist a domain name. TB won't let me do that. This company has a plethora of emails. I don't want to whitelist every single one of them. That would take me days. It is impractical. I want to whitelist the domain name which is concentrix.com. I want to ensure that all emails coming from that domain name land on the inbox folder. How can I do that on TB?

Recently, the Thunderbird email product quit working propertly. It requires me to log into the account each time I wish to open an email. This has been happening for the last week to 10 days. I have to reenter my password each time. Example, I open an email after logging in for the whatever many times it has been during the day, and I need to answer the email but need to get some information first. I go get the information and the email program requies me to log in again, even if it has been just a few minutes. This has not happened in the past. I have been using Thunderbird for a very long time, many many years and never had this happen before. I loaded the program on my laptop that I use when I travel or am not at home. Same thing happens with it.

This is highly frustrating and time wasting to have to do that. There is nothing I have found that shows me how to address this. My phone has a different email program and that does not happen when using the phone. And like I said, I have been using this email program for a very long time and have not experienced this in the past.

Is there access to a user's manual or some quick guide to help me with this? I am not a tech newby, but I'm not an IT professional either, which was why I choose using Thunderbird many years ago. It seemed user friendly at that time.

Thank you kindly for your help. Ken