AnyMailFinder.com - Find anyone's email address
Mailinator - Any Inbox. Any Time.
Hunter - Find all the email addresses related to a domain
Guerrilla Mail - Guerrilla Mail is a web-based app that provides a disposable and anonymous email address. Users of the service are not required to set up an account in order to send or receive emails.
AeroLeads - AeroLeads is a lead generation software which finds prospects with email and phone number.
Spamgourmet - spamgourmet provides email addresses that get created automatically the first time they are used, forward messages, and then automatically expire.