Firstly because I'm looking to create a solution that can be hosted centrally: the average email user is simply never going to setup and host their own mailserver and setup the encryption.
Secondly: simply using a regular encrypted partition for both SMTP and IMAP access means that partition has to be mounted permanently, otherwise new incoming mails couldn't be delivered. This means if a hacker were to gain access to the system, or if a party would force the server operators to give them access to the servers, all emails would be instantly compromised.
Secondly: simply using a regular encrypted partition for both SMTP and IMAP access means that partition has to be mounted permanently, otherwise new incoming mails couldn't be delivered. This means if a hacker were to gain access to the system, or if a party would force the server operators to give them access to the servers, all emails would be instantly compromised.