pkg net/smtp, func Dial(string) (*Client, error)
pkg net/smtp, func NewClient(net.Conn, string) (*Client, error)
pkg net/smtp, func PlainAuth(string, string, string, string) Auth
pkg net/smtp, func SendMail(string, Auth, string, []string, []uint8) error
pkg net/smtp, method (*Client) Auth(Auth) error
pkg net/smtp, method (*Client) Data() (io.WriteCloser, error)
pkg net/smtp, method (*Client) Extension(string) (bool, string)