If the open-source community can read the carbon-based ink inside carbonized ancient scrolls, then there is likely no need to open normal mail to read what it says.
Congratulations. You drastically increased my paranoia with one sentence.
"These scrolls were scanned at Diamond Light Source, a particle accelerator near Oxford, England. The facility produces a parallel beam of X-rays at high flux, allowing for fast, accurate, and high-resolution imaging. The X-ray photos are turned into a 3D volume of voxels using tomographic reconstruction algorithms, resulting in a stack of slice images."
That article is really cool BTW, amazing stuff. Give it a read.