I use a paid email service (hushmail.com) and their domain (not a custom one on their platform). It's not foolproof by itself. But then again, I also can pick

I use a paid email service (hushmail.com) and their domain (not a custom one on their platform). It's not foolproof by itself. But then again, I also can pick up the phone and call my company and know people who work there very well, so that's somewhat of an unfair advantage. Some places offer 'executive lock' features where they will have extra processes to verify and make changes to help keep your domains secure. Fabulous and Moniker are the two that come to mind for executive lock feature. Fabulous caters almost exclusively for large portfolio holders and my personal favorite. Moniker is probably a bit more friendly for more 'normal' users.