I use multiple emails depending on the use cases I need them for. But spam has a way of digging through nevertheless. And in some cases, you don't have to be the one that is responsible for getting spam emails. Anyone from your contacts can catch something and spread it to everyone in their address books and the people they have emailed in the past.

For example, you suddenly notice spam in your work email despite using a different computer only for work and no other online activities. Talking with your colleagues, they might report the same problems. It's enough for one person to slip up and you all start receiving the same penis enlargement pills. Particularly the women.