Email Open Rate
The percentage of delivered emails that were opened by recipients.
Formula
Why it matters
Open rate measures how compelling your subject line and sender name are. A low open rate means your emails are being ignored or filtered — no amount of good content inside will fix a subject line that prevents the email from being opened.
How to improve Email Open Rate
Test subject line length (40–50 characters works well), personalise with first name or company, send from a recognisable human name (not "noreply@"), and clean your list to remove inactive addresses.
B2B SaaS: 25–40%. E-commerce: 15–25%. Cold outbound: 30–50% (good list hygiene required).
Prooflytics tracks Email Open Rate automatically from your connected sources and flags it in your daily briefing when it moves significantly.
Start free trialFrequently asked questions
Is email open rate reliable after iOS 15?
Apple Mail Privacy Protection (iOS 15, 2021) pre-loads email pixels for Apple Mail users, inflating open rates by 10–20% on lists with significant Apple Mail usage. Open rate is still useful as a trend metric, but absolute numbers should be interpreted with caution. Click rate has become the more reliable engagement signal.