How to save all images embedded in email in Thunderbird?
Select View > Show As/Message Body As > Plain text and all embedded content
will become attachments. Now right-click on attachments pane, and select Save All
Another option under Debian or Ubuntu is
- Save the mail to disk as
email.eml. - Open up a terminal and navigate to the directory where you saved the mail to
sudo apt install mpackmunpack email.eml
Afterwards, all attached files or embedded images should be as single files in the current directory.
For other linuxes, mpack should be available from the respective repository.