A library for building smtp servers.
The library supplies a parser and SMTP state machine. The user of the library
supplies I/O code and a Handler
implementation for controlling SMTP sessions.
The code using the library, sends
lines received to the Session.process_line()
method. The user also supplies a
Handler
implementation that makes decisions on whether to accept or reject email
messages. After consulting the Handler
the Session.process_line()
function will
return a response that can be sent back to the email client.
Pseudo Code
// Create a handler which will control the SMTP session
let hander = create_handler;
// Create a SMTP session when a new client connects
let session = new.build;
// Read a line from the client and strip the trailing /r/n
let line = read_line;
// Send the line to the session
let res = session.process;
// Act on the response
match res.action