I use these all the time with my outlook.com account (and Gmail before that). You are right that they don't help with spam. However, they add an extra layer of

I use these all the time with my outlook.com account (and Gmail before that). You are right that they don't help with spam. However, they add an extra layer of security because now my logins have both a unique email address and password. Of course, a password manager is mandatory.