When you log into your email service provider (ESP) dashboard and see high open rates, it feels like validation. You assume your campaigns are performing well, your subject lines are resonating, and your audience is engaged.
But here’s the uncomfortable truth: open rates aren’t always as accurate as they seem. ESPs like ActiveCampaign & HubSpot often inflate these numbers, and unless you dig deeper with testing, you might be building strategies on faulty data.
Why ESPs Inflate Open Rates
Open rates are tracked using invisible pixels placed in your emails. When the email is opened and the pixel loads, the ESP counts it as an “open.” The problem is that modern inbox providers like Apple Mail often preload images or trigger these pixels automatically without the recipient ever reading your email. Many others do this too, but Apple is the largest one. If you’ve noticed gradually higher open rates each year since September 2021, that’s why.
For example, your ESP might report an open rate of 40%, while the authentic engagement could be much lower – around 20-30%. In other cases, ad-blockers & privacy settings suppress tracking, leading to undercounting. The result is a flawed metric that doesn’t give you a reliable measure of engagement.
Why This Matters for Your Campaigns
If you’re basing decisions solely on ESP open rates, you could be misled in two major ways:
1. False Positives
You might think a subject line is a winner because open rates look high, but the reality is inflated tracking, not genuine interest.
2. Hidden Problems
You might assume your deliverability is fine because engagement seems strong, while in truth, your emails could be landing in Promotions or Spam.
Both scenarios can waste your time & budget. Worse, they can prevent you from fixing real inbox placement issues that are limiting your ROI.
How ESPs Like ActiveCampaign & HubSpot Track Engagement
Each ESP has its own tracking quirks, but most rely on the same pixel-based system. For example:
ActiveCampaign focuses heavily on pixel-triggered opens combined with click tracking. While clicks are more reliable, open rates can still be inflated.
HubSpot uses similar tracking but integrates engagement data into lead scoring & workflows. If open data is inaccurate, your automation logic could be built on false assumptions.
This isn’t to say ESPs are dishonest. It’s just the nature of how tracking technology works. Unfortunately, inbox providers’ increasing focus on privacy only makes the problem worse.
The Role of Apple Mail Privacy Protection
Apple’s Mail Privacy Protection (MPP) is a perfect example of how tracking has changed. With MPP enabled, Apple automatically preloads tracking pixels, making it appear that every message is opened even if the recipient never reads it. For brands with Apple-heavy audiences, this can cause dramatic open rate inflation.
If you noticed your open rates suddenly spike in late 2021, it likely wasn’t your marketing genius. It was Apple breaking the system.
Why Using a Mail Tester Matters More Than Ever
Since ESP metrics aren’t telling the whole story, you need additional tools to reveal what’s really happening. Email testing tools allow you to run diagnostics before sending to your entire list, showing you:
- Inbox Placement: Are your emails landing in Primary, Promotions, or Spam?
- Authentication Results: Do your SPF, DKIM & DMARC records pass?
- Blacklist Checks: Is your domain or IP on a spam blacklist?
These insights provide a clear picture of whether subscribers are likely to see your email, not just whether a pixel was triggered.
How Open Rate Inflation Misleads Strategy
Imagine this scenario: your ESP shows a 50% open rate on a holiday campaign. You assume inbox placement is great, so you replicate the same strategy.
But in reality, most of those opens are inflated by Apple MPP, and a large portion of your list is seeing your emails filtered into Promotions. Your engagement declines, sales lag, and you’re unsure why.
Without testing, you would have no idea that inbox placement, not subject line quality, was the culprit.
What You Should Focus On Instead
Instead of obsessing over open rates, pay attention to more reliable signals:
1. Click-Through Rates (CTR)
Clicks can’t be faked by preloading. They represent real engagement.
2. Inbox Placement Tests
Show you exactly where your emails land.
3. Spam Complaint Rates
Reveal whether your audience finds your content valuable or unwanted.
4. Reputation Scores
Metrics such as bounce rates, blacklist checks, and domain health provide a stronger sense of long-term deliverability.
How Mail Testing Complements ESP Reporting
Think of your ESP data as the “front of the house” view and mail testing as the “backstage pass.” ESPs show you surface-level performance, while mail testing provides the infrastructure view, including reputation, authentication, and placement.
When you combine both, you gain a holistic picture of your campaigns. You’ll know whether declining engagement is truly a content problem or if placement issues are blocking your audience from ever seeing your message.
Best Practices to Avoid Falling for Inflated Open Rates
To keep your strategy grounded in reality, you should:
Always Test Before Major Campaigns
Use email deliverability software for ActiveCampaign users or HubSpot users to confirm where your emails land.
Rely on Multiple Metrics
Don’t hinge success on open rates alone.
Segment Based on Clicks, Not Opens
Engagement-based segmentation is far more reliable when you use click data.
Maintain Strong Authentication & List Hygiene
Healthy sending practices improve inbox trust, regardless of inflated ESP numbers.
The Bottom Line
Open rate inflation is an unavoidable reality in today’s email marketing. ESPs like ActiveCampaign & HubSpot aren’t deceiving you on purpose; they’re working with flawed technology in an era of growing privacy protections. However, if you rely on inflated open rates to guide your strategy, you risk poor inbox placement, wasted campaigns, and lost revenue.
By pairing your ESP with an email deliverability tool for HubSpot or ActiveCampaign users, you gain the clarity you need. You’ll see beyond inflated numbers, understand your actual inbox performance, and make smarter decisions that protect your ROI.