因此，如何有效过滤图片垃圾邮件，已经成为互联网与信息安全技术领域一个亟待解决的课题。

Therefore, how to deal with spam becomes an emergency task in the fields of the Internet and information security.

youdao

又比如，新近出现的垃圾邮件贴上了图片(也就是用图片来代替字库)，使扫描字体的邮件过滤器失效。

For example, the emerging spam tagged with a photo (that is used to replace the font photo) Failure mail filters so that the scanning styles.

youdao