If you logon to webmail account via a browser do you see those missing emails? If no, then server is not receiving them so Thunderbird cannot display them.

In which case it's possible the sender is sending to wrong email address or the servers spam filters do not like the email and they are blocking it, often the filters will inform the sender about failure to receive the email due to spam.

Maybe you have reached your server quota and that means until you delete some emails off server, the server cannot receive anything as it's full.

Do you have a Pop or Imap mail account in Thunderbird ? If POP Pop accounts can only access and download from server Inbox, so if server is scanning mail and putting it into the server Spam folder then it cannot be downloaded to a pop account.

You would only see it via webmail account in the Spam folder. Best action is to set up the email address as a 'safe sender' in webmail account regardless of whether you use a Pop or Imap account.

Is the problem account a POP gmail account ? If yes, then it's not possible to properly delete emails by putting them in the server Trash folder. So, gmail just removes the Inbox label and archives the email in the server 'All Mail' folder. If the quota starts to get used up gmail will be a pain and is well known for not allowing all email to get downloaded in one go for pop accounts. There is only one known fix. Logon to gmail webmail account and access the 'All Mail' folder. Look for all the email that do not have a label and delete them. Gmail expects people who use POP to download mail and delete off server, so gmail can be a pain at times for those using POP.

Thanks for you suggestions, but this did not resolve my problems.

I should have mentioned that this is not a gmail account, it's an earthlink.net issue. I mentioned gmail because I sent a test email to my earthlink.net account, but never received it. That gmail account is in my Address list.

My storage when logged in on my browser is only 85% full.

On my desktop app I also don't get my most recent emails unless I close Thunderbird & restart it. When it restarts it displays: No message found then latest messages are displayed. This started about a week ago.

re :When it restarts it displays: No message found then latest messages are displayed.

That sounds like nothing needed downloading, but previously downloaded mail was not showing in list, so maybe the index needs repairing.

• Right click on Inbox and select 'Properties'
• Click on 'Repair folder'
• click on 'OK'

Tried that, still doesn't resolve the problem.

Message at bottom of screen

Loading message, but nothing loads unless I stop & restart my Thunderbird desktop app

I see the latest messages in my Browser, but not in my desktop app.

Please check your computer and Anti-Virus for a VPN that has been enabled. Some AV products have a habit of auto enabling a VPN after an update. Servers do not like VPN's, they think you are a hacker because your IP address is hidden.

What Anti-Virus do you use? Do you allow AV to scan your profile folders and files because it could be scanning files that get opened so that thundrebird cannot use them.

General advise is to access AV and set up an exception to not scan any profile folder or it's contents. After all, you would not want it to do anything with any of those files as you would be likely to lose data.

What Addon extensions are installed whether enabled or not? You can find a full list here: In Thunderbird

• Help > Troubleshooting Information
• scroll down to 'Add-ons' section
• Either post an image or Copy and paste all the infor in that section.

If you restart Thunderbird in safe mode does it fetch emails?

• Help > Troubleshoot Mode
• click on 'Restart'
• click on 'Continue in Troubleshoot Mode'

Could this have anything to do with a Thunderbird Update? Thunderbird Desktop Version 128.9.2esr | Released April 15, 2025 Problems started around the date this was installed.

Extensions: Add-ons: Amazon.com Bing DuckDuckGo Wikipedia (en)

Theme: System Theme - auto Dark Light

Security Software: Antivirus: ESET Security Firewall: ESET Firewall

ESET Folder Guard - no folders are selected

Re: If you restart Thunderbird in safe mode does it fetch emails?

Help > Troubleshoot Mode click on 'Restart' click on 'Continue in Troubleshoot Mode'

Do I select any options? Disabe all add-ons Reset toolbars and controls

If you restart Thunderbird in safe mode does it fetch emails? No

Also: I have 3 different earthlink accounts in my Desktop App One of them that I seldom gets emails for

Shows: Building summary file for Inbox... but does not say Done, like the other 2 But I am not having any problems with this email account

When I try to get messages for all 3 accounts, none of them receive an email unless I shut down & restart my desktop app.

> I can receive emails from their Level 1 support but not from Level 2.

My initial observation reading this and ignoring everything else, is this doesn't sound like a Thunderbird problem.

You are on Windows 10?

• Start Windows in safe mode with networking enabled - https://support.microsoft.com/en-us/help/12376/windows-10-start-your-pc-in-safe-mode

Does the behavior change?

ESET AntiVirus has been known to cause issues with downloading emails. https://support.eset.com/en/kb7728-unable-to-access-or-receive-emails-in-thunderbird-with-eset-product-installed

Temporarily Disable ESET SSL/TLS Filtering:

• Open ESET's main program window.
• Press the F5 key to access Advanced setup.
• Click "Protections" and then expand "SSL/TLS".
• Disable SSL/TLS filtering temporarily.
• Re-enable it after Thunderbird is working properly and restart your computer.

Exclude Thunderbird from SSL Filtering:

• Open ESET's main program window.
• Go to "Advanced setup".
• Expand "Web and Mail" and then "Web and E-mail Protections".
• Click "Exceptions".
• Add an exception for Thunderbird's executable file.
• Click "OK".

RE: Temporarily Disable ESET SSL/TLS Filtering:

Open ESET's main program window. Press the F5 key to access Advanced setup. Click "Protections" and then expand "SSL/TLS". Disable SSL/TLS filtering temporarily. Re-enable it after Thunderbird is working properly and restart your computer. Exclude Thunderbird from SSL Filtering: Completed

Could not find this [see attached screen shot]: Open ESET's main program window. Go to "Advanced setup". Expand "Web and Mail" and then "Web and E-mail Protections". Click "Exceptions". Add an exception for Thunderbird's executable file. Click "OK".

Stills shows Loading... when I Get New Messages, but new messages don't load

https://support.eset.com/en/kb7728-unable-to-access-or-receive-emails-in-thunderbird-with-eset-product-installed

This link shows instructions and an image indicating 'SSL/TLS'

I can see it in your image in the left pane as shown below.

Please disable SSL/TLS - ok it and then start Thunderbird to see if it now works.

OK, I disabled SSL/TLS - ok'd it & then started Thunderbird

It still does not work.

Should I re-enable it?

I see the new emails in my browser, but not in my desktop.