Systems for providing sign-up email addresses are disclosed herein. A user may set up a sign-up email address for receiving emails from a trusted, Internet-based enterprise. The user may set up a dedicated mailbox folder associated with the sign-up email address or enterprise. The email server may automatically direct emails coming from that enterprise into that folder. To “unsubscribe,” the user needs only to delete the folder or the sign-up address. Emails from the enterprise to the sign-up address may be highlighted in the user's main inbox. Thus, the user may be assured that any such email is truly from the enterprise, and not a phishing expedition or spam. Such systems also provide the user with effective tools to recognize phish or spam emails that appear to be from the trusted enterprise and not to act on them.