Steps

• [object] define a mail object

• [function] create a mail object

• [function] retrieve a mail object

• [function] encrypt mail with pgp

• [function] decrypt own mail

• [object] define a mailbox object

• [function] push a mail to someone mailbox

• [function] list/pull emails from own mailbox

• [function] open mail from own mailbox

• [function] encrypt mail with pgp

• [function] decrypt own mail