Also known as: Email Open Rate, OR
Open rate is the percentage of delivered emails that recipients opened, calculated as opens divided by delivered messages. It is the first-stage health metric of an email campaign, measuring mainly the pulling power of the subject line and the trust in your sender name.
Mechanically, an "open" has traditionally been recorded when a tiny invisible tracking pixel in the email loads. This makes the number useful but imperfect — the pixel does not fire if images are blocked, and Apple's Mail Privacy Protection (from 2021) pre-loads images and inflates opens for Apple Mail users. Treat open rate as a directional trend, not an exact truth, and pair it with click and conversion data.
For a partner, open rate is the gatekeeper metric: nothing inside the email — the broker offer, the tracked link, the CTA — can perform if the message is never opened. A benchmark for finance-sector emails often sits in the 15–25% range, though it varies widely by list quality, sender reputation, and how you count Apple opens.
For example, an affiliate sends a promotion to 10,000 delivered subscribers and records 2,500 opens — a 25% open rate. If the subject line is weak and only 1,200 open, that is 1,300 people who never even saw the offer, capping every downstream number no matter how strong the content.
Your email platform embeds a tracking pixel and, on send, records deliveries. When a recipient's client loads the pixel, it logs an open; the platform divides opens by delivered messages to produce the rate. Because the same person can open twice, tools report both "total opens" and "unique opens" — use unique opens for the rate.
Two factors move the number most: the subject line (and preview text) that decide whether a delivered email gets clicked open, and sender reputation, which decides whether it lands in the inbox or the spam folder in the first place. Clean lists, authenticated sending domains (SPF, DKIM, DMARC), and relevant content all protect the rate.
Establish how many emails were actually delivered — bounces are excluded from the denominator.
Take unique opens, not total opens, so repeat views by one person do not distort the figure.
Divide unique opens by delivered emails and multiply by 100 to get the open-rate percentage.
Compare against your own history and finance-sector norms, and break the rate down by segment to see who engages.
A/B test subject lines and send times, and prune unengaged contacts to lift both deliverability and open rate.
Why it matters for partnership: Open rate gates everything downstream — if subscribers don't open, your broker offer is never seen. Tracking and lifting it ensures promotions actually reach eyes, the first step to conversion.
An affiliate promoting an XM deposit bonus emails 10,000 delivered subscribers. A subject line naming the specific instrument — 'EUR/USD setup + XM bonus' — lifts opens from 1,800 to 2,500, a jump from 18% to 25%, putting the offer in front of 700 more people at no extra cost.
| Metric | Measures | Driven mainly by |
|---|---|---|
| Open rate | Who opened the email | Subject line & sender trust |
| Click-through rate | Who clicked a link inside | Content, offer & CTA |
| Conversion rate | Who completed the goal | Landing page & broker offer |
A/B test two subject lines on 10–20% of your list, then auto-send the winner to the rest — a repeatable way to lift opens without guessing.
Chasing opens with clickbait subject lines that oversell, which spikes the open rate but triggers unsubscribes and complaints and delivers zero clicks.
For finance-sector emails, roughly 15–25% is a common band, but it depends heavily on list quality and how Apple opens are counted. Compare against your own baseline rather than a universal number.
Apple's Mail Privacy Protection pre-loads tracking pixels, inflating opens for Apple Mail users regardless of real engagement. A jump can reflect audience mix, not better subject lines.
Open rate measures who opened the email; click-through rate measures who clicked a link inside. A high open with low clicks means the subject line worked but the content or offer did not.
Sharpen subject lines and preview text, protect sender reputation with authenticated domains and clean lists, and remove chronically unengaged contacts. Test send times for your audience.
It is directional, not exact, because of pixel-blocking and Apple MPP. Use it as a trend and lean on clicks and conversions for decisions that matter.
Not on its own — opens only get the offer seen. Sign-ups depend on the content, the CTA, and the broker landing page after the click, so watch the full funnel.