Open Rate

Open rate is the first conversion in any email sequence: a prospect must open your email before they can read your message, click your link, or reply. This makes subject line optimization and sender identity management the two highest-leverage variables for improving open rate. A prospect who recognizes the sender's name and finds the subject line intriguing will open the email; one who finds either element generic or suspicious will not. The reliability of open rate data has been complicated by Apple's Mail Privacy Protection (MPP), launched in 2021, which pre-fetches email content and marks emails as 'opened' regardless of whether the user actually views them. This has inflated open rate metrics across the industry for emails viewed on Apple Mail — which accounts for a significant portion of mobile email opens. Teams should interpret open rates critically and weight reply rate and click rate more heavily as primary performance indicators. For video email campaigns specifically, open rate takes on additional importance because the personalized video thumbnail in the email preview pane can significantly boost click-through even before the email is fully opened. Outvid's animated GIF thumbnails — which often show the sender's face and the recipient's name — create a compelling visual hook in the inbox preview that drives both open rates and immediate click-throughs, making the distinction between open rate and engagement rate less meaningful than in standard text email campaigns.