Python：自动电子邮件发送未发送给收件人

Question

我有一个脚本可以自动发送带有csv附件的电子邮件。但是，它并没有出现在任何收件人的收件箱中;但是，当我将电子邮件添加到列表中时，它会显示在我的收件箱中。代码没有产生任何错误。有人可以请找出错误的原因吗？

boolean flood(BufferedImage img, boolean[][] mark,
                             int row, int col, Color srcColor, Color tgtColor) {


    // make sure row and col are inside the image
    if (row < 0) return false;
    if (col < 0) return false;
    if (row >= img.getHeight()) return false;
    if (col >= img.getWidth()) return false;

    // make sure this pixel hasn't been visited yet
    if (mark[row][col]) return false;

    Color asli = new Color(img.getRGB(col, row));
    // make sure this pixel is the right color to fill
    if (!asli.equals(srcColor)) return false;

    // fill pixel with target color and mark it as visited
    img.setRGB(col, row, tgtColor.getRGB());
    mark[row][col] = true;

    // recursively fill surrounding pixels
    flood(img, mark, row - 1, col, srcColor, tgtColor);
    flood(img, mark, row + 1, col, srcColor, tgtColor);
    flood(img, mark, row, col - 1, srcColor, tgtColor);
    flood(img, mark, row, col + 1, srcColor, tgtColor);

    return true;        
}

 boolean[][] mark = new boolean[citra.getHeight()][citra.getWidth()];

        for (int y = 0; y < citra.getHeight(); y++)
        {          
            for (int x = 0; x < citra.getWidth(); x++)
            {
                Color warna = new Color(citra.getRGB(x, y));
                if (warna.equals(Color.WHITE)){
                    flood(citra, mark, x, y, Color.WHITE, Color.RED);
                    break;
                }  
           }
        }

        imagebiner.setIcon(new ImageIcon(citra.getScaledInstance(300, 300, Image.SCALE_SMOOTH)));
        repaint();