This is not to track everyone's mail, but to prevent bad guys from spoofing good guys.

这个不需要追踪每一封信，但是能够阻止恶意入侵者的欺骗。

youdao

This is not to track everyone's mail, but to prevent bad guys from spoofing good guys.

这个不需要追踪每一封信，但是能够阻止恶意入侵者的欺骗。

youdao