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Reading email marketing KPIs in 2026 — open rate is dead, what counts now?

Redaktion ·

Why this matters

If you’ve run email programs over the last two years, the picture is familiar: open rates climb to 40 % and beyond, the dashboard looks green — yet clicks, orders and revenue stay flat. The reason is no mystery: since Apple Mail Privacy Protection (MPP, rolled out with iOS 15 in September 2021), open rate largely measures how often Apple’s proxy pre-fetches your email — not whether a human ever read it.

This article retires open rate as the headline metric, sums up what Apple, Gmail and Yahoo changed between 2024 and 2026, and walks through the KPI set that actually steers a program today: click rate (CTR), click-to-open rate (CTOR), conversion rate, revenue per email (RPE) and a composite engagement score. With worked examples for the typical traps.

Why open rate is dead (and what it still tells you)

Open rate classically counts loads of a 1×1 tracking pixel. Apple Mail Privacy Protection loads that pixel on an Apple proxy when the inbox syncs — regardless of whether the mail is ever opened. Result: every message delivered to an Apple Mail client counts as opened, automatically.

Scale: Apple Mail holds 50–55 % of email opens in many markets, and an estimated 60 %+ of B2C recipients are on MPP-capable versions. Brevo followed suit in February 2025 and no longer filters out Apple MPP opens by default — so this is no longer a transitional issue, it’s the new normal.

What open rate is still good for

  • Aggregate deliverability indicator. If open rate suddenly collapses across multiple sends, you almost always have a deliverability or authentication issue (SPF/DKIM/DMARC, reputation drop, spam folder).
  • Subject-line A/B tests on non-Apple segments. If your ESP offers an “exclude Apple MPP” filter and you have enough non-Apple volume, open rate is still a usable subject signal there.
  • Not a steering KPI. For campaign performance, list-health scoring and segmentation, open rate is done.

What changed in the last 12 months

Three larger shifts shape reporting in 2025/2026.

iOS 18 / iOS 18.2 — category tabs in Apple Mail

From iOS 18.2 (rollout late 2024 / early 2025) Apple Mail automatically sorts mail into “Primary”, “Transactions”, “Updates” and “Promotions” — the Gmail-tab model, now on by default on iPhone and iPad too. Marketing mails mostly land in “Promotions”; editorial newsletters tend to land in “Updates” (which actually helps visibility).

Two smaller but consequential changes ride along:

  • Digest View groups multiple mails from the same sender into one thread — individual sends become less visible.
  • AI-generated summaries replace the classic preheader on the inbox list. Your preheader is gone as a steering element; subject line and first paragraph have to carry it.

Reporting consequence: raw open and CTR numbers are no longer directly comparable to last year. Slice your metrics by tab visibility, not just “Apple vs. rest”.

Gmail/Yahoo bulk sender requirements (February 2024 → November 2025)

Since February 2024, senders pushing ≥ 5,000 mails/day to consumer accounts must:

  • run SPF + DKIM + DMARC on the sending domain
  • support one-click unsubscribe (RFC 8058 List-Unsubscribe-Post)
  • keep spam complaint rate < 0.3 % (target < 0.1 %), measured in Google Postmaster Tools
  • process unsubscribes within 2 days

In November 2025 Google escalated enforcement from “temporary delays” to permanent rejects — meaning technically present but functionally broken setups that slipped through in 2024 now get blocked.

KPI consequence: spam complaint rate and bounce rate are no longer “nice to have”. They’re hard deliverability thresholds your ability to send hangs on.

The end of the “open rate” debate at major ESPs

Brevo (February 2025), Mailchimp and HubSpot now report open rate without MPP cleanup by default. The platforms’ message is clear: don’t expect a “real” open rate — restructure your setup instead.

The KPI set that holds in 2026

Instead of one headline number, you run a composite of four to five values. Each measures something different — and the metric that moves tells you where the problem is.

Click rate (CTR)

Clicks divided by delivered emails. CTR is not distorted by MPP: Apple pre-fetches images, but doesn’t click links. That makes CTR the most robust “did anyone actually react” metric.

Benchmark 2025/2026: 2–3 % across industries, 4–5 % on transactional lists, much higher (7–10 %) on small, highly engaged B2B lists.

Click-to-open rate (CTOR)

Clicks divided by opens. Sounds even more distorted than open rate — but used carefully it’s a solid content-quality indicator, if you only look at non-Apple segments or use it as a trend metric. CTOR answers: “Of those who reached the message window, how many found the content compelling enough to click?”

Benchmark 2025: ~6–7 % average, up to 14 %+ in some industries.

Conversion rate (CR)

Purchases or leads divided by clicks (or by delivered mails — be explicit). CR is the only metric that actually shows whether the email made business. Without CR, every other number is a hint, not proof.

Revenue per email (RPE)

Revenue generated divided by emails delivered. RPE collapses volume and value into one figure. A mail with 1 % CTR and 200 € average order beats one with 4 % CTR and 12 €.

Engagement score (composite)

A per-recipient score variable built from behavior in the last 30/60/90 days — typically:

  • clicks (weight 3–5)
  • site visits from email (weight 2)
  • purchases / leads (weight 10)
  • soft bounces / spam hits (negative 5–10)

The score replaces open rate as the segmentation driver. Active score bands get full frequency, dormant bands a reduced sunset path.

Spam complaint rate and bounce rate

Not performance KPIs — health KPIs. Thresholds: < 0.3 % complaint and < 2 % hard bounce; anything above is to be repaired before tuning content.

KPI overview

| Metric | What it measures | Distorted by Apple MPP? | Benchmark 2026 | Steering value | |---|---|---|---|---| | Open rate | Pixel loads / deliveries | Yes, heavily | 30–45 % (inflated) | Deliverability indicator only | | CTR | Clicks / deliveries | No | 2–3 % B2C, 4–5 % B2B | High | | CTOR | Clicks / opens | Indirectly | 6–7 % | Medium (non-Apple only) | | Conversion rate | Conversions / clicks | No | 1–5 % per vertical | High | | Revenue per email | Revenue / deliveries | No | list-dependent | High | | Engagement score | weighted behavior | only indirectly | individual | High (segmentation) | | Spam complaint rate | spam hits / deliveries | No | aim < 0.1 % | Health threshold | | Hard bounce rate | hard bounces / sends | No | < 2 % | Health threshold |

Three worked examples

Example 1: “Great open rate, lousy revenue”

Newsletter to 50,000 recipients, 18,000 opens (36 %), 600 clicks, 30 purchases at 80 € → 2,400 € revenue.

  • Open rate 36 % — looks strong.
  • CTR = 600 / 50,000 = 1.2 % — below average.
  • CTOR = 600 / 18,000 = 3.3 % — signal: many of those “opens” aren’t humans, or the subject promise isn’t kept in the body.
  • Conversion rate (on clicks) = 30 / 600 = 5 % — solid; the problem isn’t the landing page, it’s that too few people click.
  • RPE = 2,400 / 50,000 = 0.048 € — too low to justify the list at this frequency.

Diagnosis: subject pulls (or Apple pulls), content doesn’t land. First levers are content relevance and segmentation, not “more opens”.

Example 2: “Small list, big invoice”

B2B list, 2,000 recipients, 900 opens (45 %), 140 clicks, 8 demo bookings, average deal 4,500 €.

  • CTR = 7 % — very strong for B2B.
  • CTOR = 15.5 % — content delivers.
  • Conversion rate (click → booking) = 5.7 % — solid funnel piece.
  • RPE = (8 × 4,500) / 2,000 = 18 € per email sent.

Open rate is irrelevant here — the list earns its keep through CTR and CR. Scaling lever is list growth with the same profile, not higher frequency on the existing list.

Example 3: “Re-engagement hits the wrong people”

Online shop, 200,000 recipients. Win-back trigger: “90 days no open” → 80,000 recipients pushed into a sunset flow.

Problem: with MPP, the pixel fires automatically for active Apple users — meaning the 80,000 are disproportionately Android / webmail users without MPP, exactly the cohort whose opens are reliably measured, i.e. the more engaged part of the list.

Fix: switch the trigger to “90 days no click and no site visit”. The list shrinks more honestly and you lose fewer buyers.

The composite in practice: a mini dashboard

Instead of one reporting line per send, build four columns plus a health column. Sample layout:

| Send | CTR | CTOR (non-Apple) | Conversion rate | RPE | Spam rate | |---|---|---|---|---|---| | Newsletter Apr 12 | 2.8 % | 7.1 % | 3.2 % | 0.21 € | 0.04 % | | Promo drop Apr 18 | 4.1 % | 9.8 % | 5.5 % | 0.68 € | 0.12 % | | Win-back Apr 22 | 0.9 % | 4.3 % | 1.1 % | 0.02 € | 0.21 % |

Reading: the promo drop clearly outperforms at acceptable spam rate. The win-back underperforms and drifts toward the Gmail threshold (0.3 %) — that’s the first send to fix, not the weakest newsletter.

FAQ

Should I drop open rate entirely from reporting?
No. It still works as a deliverability early warning. What goes is its role as a steering KPI for content, subjects or segmentation.
Is filtering Apple opens enough?
It helps trend comparisons, but doesn't solve the core problem: you lose the majority of your list from the KPI. Better to demote open rate overall and switch to CTR/CR/RPE.
How does CTOR change under iOS 18 / Apple categories?
When mails land more often in "Promotions" and that tab gets clicked less, opens and clicks fall together — CTOR stays surprisingly stable. CTR and RPE show the tab effect more clearly.
Does this also apply to B2B?
Yes, because many B2B recipients read their work account on iPhone/Mac. The distortion is on average smaller in B2B than in B2C, but not gone. Composite reporting is the more honest option in B2B too.
Do I need a new ESP for all this?
Mostly no. Brevo, Mailchimp, HubSpot, Klaviyo, ActiveCampaign all deliver CTR, CTOR, conversion tracking (pixel or server-side) and engagement scoring. What you need is a reporting sheet that shows the five composite KPIs side by side — not necessarily new software.

Conclusion

Open rate hasn’t been credible as a steering KPI since Apple MPP — and with iOS 18 categories, Gmail/Yahoo sender requirements and the reality of 2026, even less so. What’s left is a composite of CTR, CTOR (carefully), conversion rate, revenue per email and a weighted engagement score. Plus health KPIs (spam complaint, bounce) which now decide whether you can send at all.

In practice: rebuild your reporting around four to five columns, switch re-engagement and sunset logic from opens to clicks/purchases, verify authentication (SPF/DKIM/DMARC) and one-click unsubscribe — and accept that year-over-year open rate comparisons honestly don’t work anymore. Anyone still presenting open rate as the headline number in 2026 is selling stakeholders a picture that no longer maps to the business.

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