A-ha for Web Email - Web e-mail tracking. A-ha for Web e-mail tracks outgoing Web e-mail for Yahoo and/or Hotmail notifying you the moment your e-mail is read by the recipient. Works within Internet Explorer and Yahoo/Hotmail windows. To use, log in to Yahoo or Hotmail, compose your e-mail message as normal but send out your message with A-ha. Your message will be appended with our patented tracking technology informing you the moment your e-mail is read.