Mac 911 How to open a stubborn email attachment in Mail on your Mac Apple Mail may wind up with broken permissions that prevent you from opening files you should have access to.

MBOX files can be opened on MacOS, iPhone, Windows and Android. What exactly are MBOX files? MBOX files are a container for multiple, compressed email files.

It's easy to attach a file in an iPhone email using the new format bar in Mail with iOS 13, or in the Gmail app. Here's how to do both.