No email should ever be sent from a do-not-reply return address. Ever. You have no idea how much email I get because some idiot used my email address to sign up

No email should ever be sent from a do-not-reply return address. Ever. You have no idea how much email I get because some idiot used my email address to sign up for something/order something/whatever. To this I'd also add: Always confirm email addresses. Every time someone signs up for an account, send a confirmation email with an easy means of notifying you that I'm not the person who signed up for the account. So few do this.