Just to be on the safe side, you ought to delete the email, and the attachment, from your computer and then empty your Recycle Bin.

安全起见，你应该把电脑里的邮件和附件删除，同时清空回收站。

youdao

This is not true, when you delete a file and empty it from the recycle bin, the file is in fact still on your hard drive.

这是不正确的，当您删除文件和空它从回收站，该文件实际上是仍然在您的硬盘驱动器。

youdao

You can also sift through your hard drive, delete temporary files and empty your recycle bin.

CNN: dotCOM Tools: Healthy PCs