There has been a minor privacy issue in Tutanota. It didn't affect security or encryption.

Despite image loading being blocked, images contained in some emails were loaded & senders were able to see when such emails were opened.

We've fixed the issue: github.com/tutao/tutanota/issu…

#transparency

Automatic image loading bypass with background-image: image-set · Issue #5296 · tutao/tutanota

Code such as this:

^GitHub