I think we've probably all received emails from friends that only have link in them or want us to download some random program. I often get emails from friends with .php links. I still don't completely understand php, but from what I've read, it seems that php is a programming language that is used for server-side website development or can just be used as a programming language. Server-side scripting (more info at: http://en.wikipedia.org/wiki/PHP#Functions) can be used to deliver results back to a client. I found an article from aw-snap.info (http://aw-snap.info/articles/spam-hacks.php) that explains how it can be used by hackers. I've only added a few lines to scratch the surface and give you an idea. It's not meant to be an exhaustive explanation.
This is for iMac version 10.9.3. Open your iMac email program. (Please click on photos to enlarge them if needed.)
|Click on File and then Accounts|
Once you've set up and imported your emails, highlight all emails that you want to save to your computer. Then click on File and scroll down to Print.
I hope this post is useful. Happy saving!