Iphone 5 apple password problem?

Okay, i have this iphone which i wanna sell. But the thing is i don't remember my apple password. Okay so i clicked on reset password and then i clicked on email authentication.till now everythings alright. But when i open my account there's no mail from apple. Whys that? :/

Frustrated, Thanks!

Just restore it, it's the only way plus if you're selling it than you should restore it anyway to prevent them from accessing your information.