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I'm dealing with a properly updated 'bird: 140.5.0 (32-bit) running on an equally updated Windows 10 desktop. First thing this morning, out of nowhere, I started getting an "unable to write the email to the mailbox..." message when sending, thus I could send but not save. And then I realized I wasn't receiving either, on all three accounts in my Thunderbird. I stopped everything and focused on trying to fix this. It's been an all-day, losing effort. So far.

I tried the various quick checks and fixes recommended here and there: I'm running the program as an administrator. I restarted the program. I rebooted the computer. I think I have enough disk space, but to be sure I deleted some bloat from possibly overly large files. I compacted, even though the program is configured to do that regularly. I temporarily disabled my antivirus program. I went into my webmail and deleted all messages that have arrived since my Thunderbird stopped receiving, in case one of them was corrupted. And probably some other attempts as well. Nothing has helped.

And now a second, even worse issue has fallen from the sky. Thunderbird opens. The folder list is where it always has been. The number of unopened messages in each folder is there in boldface, as always, but...the folders are all blank and I get the dreaded popup: "unable to open the summary file...." Have I lost my years' worth of carefully curated emails?

I've tried folder repair. I've deleted parent.lock. Etc. Nothing. Nothing. Nothing.

I will be super-grateful for any wisdom sent my way.

Been getting a bunch of this, usually in my TB TRASH folder, I think from the Outlook online server.

The server couldn't retrieve the following message:

Subject: "Stephen Tanner"

From: "Not available" ("Not available")

Sent date: 10/31/2024 2:25:02 PM

The message hasn't been deleted. You might be able to view it using either Outlook or Outlook Web App. You can also contact the sender to find out what the message says.

What does this mean? Outlook or Thunderbird? What do I need to do?

I am able to receive emails with my Spectrum account but unable to send. My SMTP entries are Description Server Name mail.twc.com port 587 Connection security SSL/TLS Authentication normal password When I test the connection it passes and I can see my emails but am unable to send emails and get this message Sending of the message failed. The message could not be sent because connecting to Outgoing server (SMTP) mail.twc.com failed. The server may be unavailable or is refusing SMTP connections. Please verify that your Outgoing server (SMTP) settings are correct and try again. When I look in the Thunderbird settings/privacy and security the only password entry is for IMAP password. Do I have to have and entry for SMTP password or is it the same for both? If I do how do I get an entry there. If any other information is needed please let me know. Thanks

When I click on an email, instead of just showing the email, it sets up a Reply screen showing From me and To Me. At the bottom there is an alert: "A unique identity matching the From address was not found. The message will be sent using the current From field and settings from identity......" (lists my email user name and address). Im not clicking Reply, I'm just double clicking the message to Read it.

Running Sequoia 15.7.2 on MacBook Air. It just started today. I have turned it off and on, no change.

‘We formerly had our email with Cox Communications, and had used Thunderbird. Cox ended their email and said we should use yahoo.com and we could keep our email address, which is [edited] @cox.net.’ Can we still use [edited email from public forum] @cox.net for ‘Thunderbird’ as well? I definitely prefer Thunderbird!

I have been trying to delete a large number of unwanted emails in my All Mail folder. However, once I delete them they are restored. How can I clean up this folder permanently?

Hello, I can receive email messages but unable to send them out. The error message I get follows:

The mail server responded,( bettyweber@shaw.ca sender) rejected AUP#POL. Verify your email address is correct in account settings.

What can I do to fix this in Thunderbird?

I checked with my service provider and I can receive and send messages through webmail but not Thunderbird.

Thanks. Betty

Hi, I am using Thunderbird on my Android phone and PC. When I send emails from my Android phone, the emails are sent but a copy is not stored in the "SENT" folder of my phone. This feature used to work in the past, but now it doesn't anymore.

How can I resolve this? Thank you.

When I send an email the recipient receives lots of information above the email. It seems to show all the security paths the email has gone through. It goes on and on. I have gone in to View and set Headers to Normal. But doesn't really work. If I Forward an email again all the information appears that the recipient does not need to know. HELP! If I delete the information I get rows and rows of lines.

Hello, I'm using the most recent version of Thunderbird on a desktop using Windows 11. Just this morning (Aug 11), all incoming email to all my four accounts are coming in with no subject or correspondents showing and when opened the email is not formatted in HTML, just plain text and lots of code. I have tried several fixes with no success: repair folders, turn off all add-ons and anti-virus protection, uninstalled and reinstalled software. Can you help, please? Thanks!

Hi, I am using Thunderbird on my Android phone and PC. When I send emails from my Android phone, the emails are sent but a copy is not stored in the "SENT" folder of my phone. This feature used to work in the past, but now it doesn't anymore.

How can I resolve this? Thank you.

Why in Thunderbird desktop I can set checking for mail to every 1 minute but in Thunderbird Android I only have the option to fetch mail every 15 minutes?

This needs to be changed ASAP! I need to make replies to urgent emails quickly! I shouldn't have to wait 15 minutes for Thunderbird to check for new emails or for me to keep pressing check for new emails. Gmail and FairEmail get my new emails straight away!! Thunderbird Android takes ages

Please change and fetch new emails ASAP! I love Thunderbird and have used Thunderbird since it was first released! But Gmail and FairEmail I use because of this issue! Look at my screenshot! 15 minutes is a joke!!

I have had Thunderbird on my HP laptop for several years. Everything has worked perfectly. BUT, I cannot receive Email, starting yesterday. When I click the Get Email icon, nothing happens. My Email server on Comcast is getting Email which I can see and read, but Thunderbird is not getting the Email. I would appreciate any advice.

Regards, Jim

Hi,

On Thunderbird 140.4.0esr (64-bit) and on 144.0.1 (64-bit) both WIN11 I have this problem since yesterday:

New message Signature is shown

I add the To: To: xyz@com.com

Signature disappears, mail is sent and received without signature

The signature which I use "since many years" is HTML

As you know there has been an update on WIN11 yesterday...

Any hints?

Thanks for your time

Bob

I had knee replacement surgery on 10/10/2025 and was unable to access my PC to download email. When I was able to access my PC(physically unable to get to the PC until12/7/2025) email had stopped downloading after 10/27.2025 and many of the ones downloaded were multiple copies of the same text. I decided to just highlight a large group of email and just trash them unread. I have now trashed 5000+ emails and the system will stil not display any after 10.27/2025. I am at my whits end, I am a 78 year old retired non-software engineer and really need some help. This is my primary email account and really need to read what's current.

For 3 days, I haven't been able to access my GMX email account. It tells me every time "Login to the server imap.gmx.com with username '[edited from public] @gmx.com' failed. I hadn't changed anything beforehand and all the entered data is correct. My other accounts like gmail, yahoo, works just fine. Tried installing older versions and still no success. Outlook app works fine either. I'm pretty sure that GMX mail server made some changes that Thunderbird is missing. Please verify.

Best regards

Nilson Xavier

Hello everybody!

Since a few days I'm a bit in trouble with using my Mozilla Thunderbird email system. I do receive emails, but I neither can answer them nor can I write and send emails on my own.

When I try to send a message, this is what I'm confronted with:

Failed to send message. Error sending message: SMTP server error. The mail server responded: IP=212.103.61.109 - Your address is blocked.

Is there anybody who can help me? Would really be great!!!

Thank you in advance.

Klaus Maier