You'll receive an email within 24 hours of a DNS A or MX record being registered for a domain similar to your selected domain.
You'll also be alerted if a similar domain changes or unregisters its A record.
All subscriptions come with an RSS feed of all alerts.
You can cancel your subscription at any time but cancelling your subscription will not result in a pro-rata refund.
Your email address will never be used for anything other than sending you subscription verifications, alerts and subscription-related correspondence for the domain(s) you subscribe to.