Thunderbird crashing when sending mail from my lineone.net account

[argchichester]

My email has been working fine and I haven't made any changes to my accounts for a long time.

Yesterday, however (4th August 2025) my lineone.net account is causing Thunderbird to crash (and in fact locks out the whole system).

If I send a message it appears to be sending ok, but then I get an error message saying "Your message was sent but a copy was not placed in your sent folder (sent) due to network or file access errors".

Thunderbird then crashes both itself and the whole system and I have to do a hard reboot to get the system up again.

The email is actually being sent but not being placed in the sent folder.

My tiscali.co.uk account is working correctly through Thunderbird without issue.

I have tried sending directly from web mail which is also working correctly.

I have reloaded Thunderbird with the same results.

I have also run a system restore from about a week ago but no difference.

As mentioned, I have not made any changes at all to my settings and this problem has only arisen over the past 2 days.

Any help would be very much appreciated!

[nameunknown_]

@argchichester 

Okay, I shall leave you to sort it out yourself.

As you have 50 years of experience in IT, I guess you have probably already thought to:

* look at the crash reports

* check whether the issue is related to the Thunderbird Sent files for the account

etc.

[kanya-TT]

Because it's working fine on your TT webmail, please contact relevant help from Thunderbird. As it's an issue within the client email app.

Kanya

[argchichester]

@nameunknown_ 

Yes, I do know the difference (50 years in IT).

As I have already posted, I have run both a system restore and a full C: drive image restore. (Both made when the system was working correctly).

Sorry, I am really frustrated and my patience is growing thin.

Thank you for your ideas, I will have a look later when I have calmed down a bit! I just want my email to work again.

Best regards Tony

[nameunknown_]

@argchichester 

I thought you said you did a system restore, which is not the same as restoring the entire drive from an image. Are you saying you have restored the entire drive from an image?

There are other possibilities that may be causing the issue. This page https://www.blrtools.com/blog/thunderbird-crashing-freezing/ suggests possible solutions. You may want to start with number 10. Once in troubleshoot mode, select "More Troubleshooting Information" from the Help menu, then scroll down to Crash Reports, and take a look at what the report says.

[argchichester]

@kanya-TT 

Yes I can send and receive ok via webmail.

I can receive email from my lineone account just fine within Thunderbird - the problem is sending, replying and creating emails and I get the "Your message was sent but a copy was not placed in your sent folder (sent) due to network or file access errors".

Thunderbrd then stops responding and the whole system crashes requiring a hard (on the button) reboot which exits Windows improperly.

Tony

[kanya-TT]

Hey @argchichester. Are you able to send and receive emails on webmail. 

Kanya

[argchichester]

Hello again @nameunknown_ 

I understand what you are saying but as explained I am running on a fully restored C: drive so how can there be a corruption present? I agree that there might have been a problem with the Thunderbird version before I did the full restoration, but I am now running on a rebuilt system, backed up when everything was working correctly.

I hate computers.

Tony

[kanya-TT]

On webmail you can perfectly send and receive emails, right? 

Kanya

[nameunknown_]

---

@argchichester wrote:

I  don't quite see how this is a Thunderbird issue as I have not made any changes at all to Thunderbird or to my TalkTalk settings for a very long time.

---

You may not have made any changes, but it is possible that Thunderbird is not functoning correctly due to something being corrupted. The fact that Thunderbird is crashing may also point to there being something wrong with the application or configuration files.

On a previous occasion, you said "Web mail continues to work correctly."

Webmail is just another user interface to the servers for your email account. If there are no issues sending emails via webmail, then it seems likely the issue preventing you sending emails via Thunderbird is related to Thunderbird.

One way to fix possible corruption may be to delete the account from Thunderbird and re-create it. If you are using IMAP, then all of your emails should be restored after you re-create the account in Thunderbird. If you are using POP and not keeping copies on the server, then you would need to save emails to local folders, and restore them to the account from the local folders.

[argchichester]

@kanya-TT 

Yes, Web Mail is working correctly.

Tony

[argchichester]

Hello @nameunknown_ 

Many thanks for your message.

Sadly, I have already checked the settings within Copies and Folders.

I unchecked the Sent Folder option and selected "Other" asd selected "Sent on" my email address.

Ditto for Drafts and Templates.

I then tried sending an email and it worked!

However, sending further email resulted in exactly the same error as before.

I  don't quite see how this is a Thunderbird issue as I have not made any changes at all to Thunderbird or to my TalkTalk settings for a very long time.

Everything was working just fine until mid day on the 4th August.

So far I have run a system restore from about a week ago. I have completely restored my C: drive from backup. I have reinstalled Thunderbird. I have run Norton's registry cleanup. I have given Thunderbird full access rights in Norton 360 all with no effect.

The only thing I haven't done (yet) is to delete Thunderbird and do a full reinstallation. However I don't see that this is the issue as everything was working correctly and I am now running on a restored C: drive.

This is driving me crazy - help please!. Regards Tony

[nameunknown_]

@argchichester 

I think this is an issue with settings in Thunderbird, rather than directly with your Lineone email account.

I have been able to partially replicate the issue that you have. I had an account where no folder was selected for saving a copy of sent emails. When I sent an email, this message popped up: "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 address here>. Fortunately, in my case Thunderbird does not crash.

Right click on the account name (email address) in the left pane, select Settings, then select 'Copies & Folders' for the account. What is selected for 'Place a copy in'? As you also have an issue with draft messages, what is selected for 'Keep draft messages in'?

[kanya-TT]

Have you tried webmail? 

Kanya

[argchichester]

Hello @kanya-TT .

Thank you for your message.

Not quite sure what you mean, but yes this is a mail problem with my primary TalkTalk email.

Tony

[kanya-TT]

Hey there, @argchichester. Is the email in question related to your TalkTalk email. 

Kanya

[argchichester]

Hello again. many thanks for getting back to me on this @siphosethu-TT 

I have checked out the settngs you suggest but can confirm that I am not using an encrypted password.

I am using  SSL/TLS connection security and port 993 for IMAP.

My problem is not with receiving email - that is working just fine.

The errors are happening when I send an email "Your message was sent but a copy was not placed in your sent folder (sent) due to network or file access errors".

Also occuring when system tries to save a draft copy of new mail or when replying to an email.

Thanks again, regards Tony

[siphosethu-TT]

Okay so I've gotten some information and need you to use the steps below so we can resolve the issue.

If you use the “Thunderbird” application and have issues retrieving your emails, you need to check that you’re not using an “Encrypted password” in your settings. Using “Encrypted password” has been superseded and we no longer support it.

To make sure you’re not using “Encrypted password”, follow these steps:

1. In Thunderbird, go to your TalkTalk Mail account and click on Views settings for this account
2. Select Server Settings, in the list on the left
3. Make sure Normal password is selected as the Authentication method.
   
    

If you switch from “Encrypted password” to “Normal password”, please make sure you use SSL/TLS as the “Connection security” (together with Port 993 for IMAP or Port 995 for POP) to maintain the maximum level of security. Thanks

[siphosethu-TT]

You are most welcome, please bare with me on this one. Thanks

[argchichester]

Thank you so much @siphosethu-TT 

Regards Tony

[siphosethu-TT]

Hi there @argchichester, please use webmail for the time being while we figure out a way to fix this as soon as possible. Thanks