Open Rate

Open rate is the percentage of email recipients who open a given email, calculated by dividing unique opens by the number of emails delivered. It is a key indicator of subject line effectiveness and sender reputation. With Apple Mail Privacy Protection, open rate tracking has become less reliable, making open rates less dependable as a standalone metric. Many teams now treat open rate as a directional indicator rather than a precise measurement. Why it matters: open rate is the first gate in your email marketing funnel. If subscribers are not opening your messages, no amount of excellent body content or offers will generate clicks, leads, or revenue. Consistently low open rates can also damage your sender reputation over time, causing more emails to land in spam folders and creating a downward spiral in deliverability. A healthy open rate varies by industry, but the average across all sectors typically falls between 17 and 28 percent. To improve open rates, focus on writing concise, curiosity-driven subject lines, segmenting your audience for relevance, sending at optimal times based on your audience's behavior patterns, and regularly cleaning your list of inactive subscribers. A/B testing subject lines and preview text across small segments before sending to your full list is one of the most effective tactics for consistent improvement.