2
one is personal, mostly for signing up for accounts and stuff. the other is business, but i rarely check it because most emails are the yearly "hey, pay us to renew your web hosting for next year"
technically i do have 3, but its only to get student prices if available (like amazon prime). i sign up as a student at a local community college, get the email, and never actually take a class. the only downside is every semester i have to remember to renew my student status.