How many email addresses do you have?

I've recently been working to minimize my email clutter, my dependance on certain email providers, and to consolidate services under certain accounts.

I'm down to the following uses:
Apple ID, mydomain-billing/subscriptions, mydomain-official/legal, anon, friends/family, business domain.

I also have a handful of aliases and an account just for newsletters and my RSS app.

I'm curious if others have several email addresses for similar uses or if you use your email client to categorize incoming messages for you. For people who only have one email address, how do you manage this?