Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Thunderbird email not sending after 68.10.0 update

  • 6 replies
  • 1 has this problem
  • 100 views
  • Last reply by Beano

more options

Since the Thunderbird 68.10.0 update I cannot send emails . I get an error message saying the connection was lost in the middle of the transmission. Receiving emails OK. Using Windows10 and Bitdefender. It works on other machines.

All Replies (6)

more options

To diagnose problems with Thunderbird, try one of the following.

Restart the operating system in safe mode with Networking. This loads only the very basics needed to start your computer while enabling an Internet connection. Click on your operating system for instructions on how to start in safe mode: Windows 10, Windows 8, Windows 7, Windows Vista, Windows XP, OSX

If safe mode for the operating system fixes the issue, there's other software in your computer that's causing problems. Possibilities include but not limited to: AV scanning, virus/malware, background downloads such as program updates.
more options

Many thanks. That works and I can send emails now. What now? Is it my virus checker, malware etc. I will ask my IT friend.

more options

Add the TB profile folder as an exception to Bitdefender:

https://www.bitdefender.com/consumer/support/answer/13427/

Help/Troubleshooting, about:profiles, to show the profile location.

Also, disable scanning of secure (SSL) connections in BD.

more options

changed outgoing security to STARTTLS and port 587 and it now works in normal mode. Another question, how do you recover old emails? In the process of fixing the send function an account was deleted then reinstated. All previous emails are gone.

more options

The mail for the deleted account is probably still in the profile folder, in a Mail/<popserver> subfolder (while the reinstated account is in Mail<popserver-1>). Copy the mbox files - the large ones with no extension, named after folders, e.g. Inbox - into Mail/Local Folders. They should appear under Local Folders in the Folder Pane when TB restarts.

more options

Thanks, I think I still have to change the X-Mozilla-Status to 0000. ll good now.