use Result;
use Parser;
use ;
use crateSmtpClient;
/// Send a raw SMTP command and print the verbatim server reply.
///
/// The command is sent as-is, without trailing CRLF (e.g. `NOOP`,
/// `VRFY foo@bar`, `HELP`), and the full reply is read back. Any reply
/// code, including 4xx and 5xx, is returned as output rather than an
/// error. Reserved for simple request/reply commands; `DATA` and
/// `STARTTLS`, which switch the stream into a different mode, are not
/// supported.