It doesn't have to be the emails password and in a security sense you wouldn't want to give your password to your email to someone who now has your email address. Of course I have double verification enabled on my emails so you need to put in a code sent to my phone in a text in order to access the accounts but it still bad practice to use the same password security wise. That being said I'm guilty of it myself except for important things like my bank account, credit cards and to log onto my servers they have special passwords.