Just out of curiosity, what is a cold boot attack?
https://en.wikipedia.org/wiki/Cold_boot_attack
tl;dr they pull the decryption keys from your computer while it's still running, which of course it is because your mail server has to be up 24/7.
https://en.wikipedia.org/wiki/Cold_boot_attack
tl;dr they pull the decryption keys from your computer while it's still running, which of course it is because your mail server has to be up 24/7.