Is Quick Look secure?

I don't think it's going to run malicious scripts like Outlook does, if that's what you're asking.

Most issues with attachments are only going to affect people on Windows computers as that's the platform they target. Quicklook only works with a few file types which are usually thought as being secure.

As far as I know, Quicklook just renders the object. Could someone craft some malicious exploit of Quicklook? I don't have the knowledge to say if it is probable, but I doubt it.

I also don't imagine Quicklook is not going to respond to any requests embedded in the file.

Quick Look does as its name suggests, allowing you to quickly look at a file without actually opening or even having the application that edits the file. It is not just in Mail. It can also be done in the Finder, and perhaps other applications, since it seems to be a system-level service.

It has never been a tool for protecting against malicious attachments in Mail.

Most issues with opening attachments have been on Windows computers. I have not come across any kind of attachments that are detrimental on a Mac.

I agree with the answers here, that QuickLook is a simple application on Mac that allows you to look at (as it says) the attachment without actually executing it or opening the file.

But, no one will be able to guarantee that the mail you receive is absolutely "safe" and free of nefarious files. Not even Apple.

If you are this paranoid, please install a virus check program on your computer. There are several out there for MAC's from "free" to expensive.

For myself, I don't think I need one. But, I try to keep up with the latest observations and act accordingly.

The simple way to protect yourself is never open a file that has come from someone you don't know, or one that you did not ask for. And be careful where you point your browser! If you frequent trashy sites, then you're bound to get dirty at some point.

I guess the best protection is common sense.

Jon