Your dashboard says 70 percent of people opened your last email. Feels great. It's probably not true.
If your list has Apple Mail users on it, and almost every list does, a big slice of those opens never happened. Apple's servers opened them for you.
What is Apple Mail Privacy Protection?
Apple Mail Privacy Protection, or MPP, is a feature Apple ships with Apple Mail. When it's on, Apple pre-fetches the images in your email, including the tracking pixel, on Apple's own servers.
That pre-fetch happens whether the recipient reads your email or not. Your tracker sees the pixel load and logs an open. The person may never have touched the message. You can read a fuller definition in our [glossary entry on Apple Mail Privacy Protection](/glossary/apple-mail-privacy-protection).
Here's the part that makes it a big deal: Apple Mail is roughly 58 percent of email client market share, per Litmus. This isn't an edge case. It's the single largest email client in the world, reporting opens that didn't happen.
Why does every Apple Mail recipient look like an opener?
Because the pixel fires either way. That's the whole trick.
A tracking pixel works by loading a tiny image when the email is opened. MPP loads that image in advance, on a schedule you don't control, from Apple's infrastructure. To a naive tracker, an Apple pre-fetch and a real human open look like the same event: the pixel loaded.
So the tracker counts both. Every Apple Mail contact on your list becomes an "opener" the moment Apple's servers get around to fetching your images. The prospect who deleted your email unread? Opener. The one who's on vacation? Opener.
How much does this inflate your numbers?
A lot. Raw open rates on B2B lists typically run 2 to 3 times inflated. A reported 70 percent open rate is often 25 to 35 percent real reads.
MPP isn't the only culprit. Corporate security scanners like Mimecast, Proofpoint, and Microsoft Defender open every link and image in incoming mail to check for malware, and 15 to 25 percent of B2B recipients sit behind one. Gmail serves images through its own proxy too, which muddies the picture further. But MPP is the biggest single distortion because of Apple's market share.
The practical damage: you follow up with people who never read your email, and you deprioritize people who did. Your "hot" list is full of ghosts.
Can you just ignore Apple Mail opens?
Throwing them all away overcorrects. Some Apple Mail users really do read your email, and a real read is worth knowing about.
The good news is that MPP pre-fetches are the clearest machine-open class there is. They have a recognizable signature, so a tracker that actually inspects each open can filter them with high confidence. They should stay filtered, always. No judgment call needed.
The harder cases, like Gmail proxy opens or scanner activity, need more nuance. That's where grading beats guessing.
How do you get a real open count?
You grade every open instead of counting every pixel load. That's the short version of how Outsolvi does it.
Every open gets scored from Tier 1, high-confidence human, down to Tier 5, bot or scanner. The grade comes from signals like request timing, network origin, and client signature. Opens below a 25 percent confidence floor are excluded from your counts. The model agrees with human-rated classifications 95 to 98 percent of the time, and Tier 1 false positives run under 2 percent. The full scoring approach is documented on our [methodology page](/methodology) and in the [confidence scoring feature](/features/confidence-scoring).
And you don't have to take the grade on faith. The [Diagnose view](/features/diagnose-open-evidence) lets you click any open and see exactly why it counted or got filtered.
What should you do this week?
First, stop treating your raw open rate as truth. If it's suspiciously high, it's inflated. Mentally cut it in half and you're closer to reality.
Second, look at how your current tracker handles Apple Mail. If it can't tell you, that's your answer. Most tools on the market count every pixel load, which is why [comparing trackers on filtering](/compare), not just price, matters.
Third, if you want graded opens instead of raw ones, Outsolvi is $7 a month billed yearly, with a 14-day free trial and no credit card required. Run it next to your current tool for two weeks and compare the numbers. The gap is usually the wake-up call.