src/Mailer/SMTP.php
protected function quit()
    {
        $in = "QUIT" . $this->CRLF;
        $code = $this->pushStack($in);
        if ($code !== '221'){
            throw new CodeException('221', $code, array_pop($this->resultStack));
        }
        return $this;
    }
protected function quit()
    {
        $in = "QUIT" . $this->CRLF;
        $code = $this->pushStack($in);
        if ($code !== '221'){
            throw new CodeException('221', $code, array_pop($this->resultStack));
        }
        return $this;
    }
SMTP QUIT
SUCCESS 221
@return $this
@throws CodeException
@throws SMTPException