A new service called Bananatag allows personal email senders to add open and click tracking to their individual messages using the same image and link tracking techniques employed by ESPs. The service integrates with almost any email service, through a Chrome and Firefox extension for Gmail, a plugin for Outlook, or through a tweak to a contact's address. Bananatag is free for up to 5 emails per day and $5 per month for unlimited tracking.