Mail Detective是一款能够探测出邮件发送地的软件，你只需要在邮件客户端中将邮件拖拽到Mail Detective窗口中，之后它就会为你探测出该邮件的发送位置。
Mail Detective 1.x | MacOSX | 4 Mb
Mail Detective is a Mac app that helps you decide if that email you got in your inbox is valid or scam by trying to trace its geographic origin. Simply drag an email message from your mail client onto Mail Detective's window or app icon and the app shows you the country and – if possible – the city this message was sent from.
If your mail client does not support drag and drop of mail messages, you can use the built-in system service or copy and paste raw message source text into the app.
OS X 10.9 or newer, 64 bit processor