[cgufus]

I can't find any information on the following questions:

Are all past versions of OS X / Apple Mail affected? For what OS X Version does Apple provide a security update regarding this issue? Has anyone found a fix that prevents auto-uncompression (such as a "defaults write com.apple.mail xyz False" command)?

Due to several reasons, I am also on an older Version of OS X and this issue makes me a bit nervous.

[tethys]

From Apple's patch notes [0]:

> Available for: macOS Mojave 10.14.6, macOS High Sierra 10.13.6, macOS Catalina 10.15.5

[0]: https://support.apple.com/en-us/HT211289