Discovery
by ChristiaanWhen I first came across this concept it immediately made sense to me. I have a unique password for each website or online service that I use, so why not have a unique email address as well?
The reason behind using a unique password for every website or online service is that should an attacker compromise said site or service, they will only obtain the password for the compromised site/service. But to me that only solves half of the problem. A compromised site/service would still expose my email address which is one of the two pieces of information used on so many different sites/services to log in.
Now, having a unique email address as well means that if an attacker compromised a site or service they would obtain an email address that is unique to the compromised site or service, thus minimising your exposure in this way.
