Email Open Rate

Email open rate estimates the proportion of delivered or otherwise defined recipient emails recorded as opened, depending on the email platform's calculation. An appointment reminder campaign might show opens, but image-based tracking and privacy features can make that figure unreliable as proof that a person actually read the message. Some email clients block tracking, while others preload content. Open rate therefore works best as a limited diagnostic signal, not a guarantee of audience attention. A small service business should also examine replies, clicks, bookings, and delivery problems. Define the denominator before comparing reports from different tools, since their measurement rules may differ.