Re: [Guide] How to know if your email address was part of any data breach.
I saw some similar site on the internet which titles "Have your password been pwned?" Some of them might just stored the passwords I think, so everyone should be a little careful while actually entering personal information on sites to check. Don't be pwned while checking whether you've been pwned. 
I will never type a password anywhere on similar website, mail is completely a different kettle of fish. When it comes to login on exchange, it's good to have separate email only for use it there