A new service called DidTheyReadIt from Rampell Software lets you track every e-mail you send and tells you if, when, and how many times your e-mail was read — even how long the message was read, if it was forwarded, and the reader’s physical location. Mac compatible, it’s now available for trial and purchase. The DidTheyReadIt trial is free, but is limited to five messages. Subscriptions are US$24.99 for three months, $39.99 for six months, or $49.99 for a full year.