How do cold email tools handle tracking pixels?

Your cold email tool says 67% of prospects opened your email. But something feels off. Your replies are in the single digits, and nobody seems to know what you said. So what's actually happening?

Here's the mechanics. Every time your tool sends an email, it embeds a tiny transparent image (1x1 pixel) into the message body. That image has a unique URL tied to the specific recipient. When the email is opened and images load, the recipient's device fetches that image from your tool's server. That fetch gets logged as an open. Simple enough.

The problem is that "images loading" doesn't always mean a human is reading your email.

Apple Mail's Mail Privacy Protection (MPP) pre-loads all images in every email before the recipient even touches it. So your pixel fires whether they opened it or not. On lists with heavy Apple Mail users, you can see open rates inflated by 20-40 percentage points just from that alone.

Beyond Apple, there are a few other ways your pixel fires without a real open. Corporate email security gateways scan incoming messages and load all embedded content to check for malicious code. Spam filters sometimes do the same. And some recipients have images disabled entirely, which means genuine opens go untracked while bot scans get counted.

So your open rate is a mix of real opens, Apple pre-fetches, security scans, and image-blocking blanks. You can't separate them just by looking at the number.

Most cold email tools let you turn off open tracking entirely, and many experienced cold emailers do exactly that. Sending plain text (or HTML with no pixel) removes one more thing that security gateways flag, which helps deliverability more than most people expect. It also forces you to measure what actually matters: replies.

Replies don't lie. A reply means a human read your email, thought about it, and typed a response. You can't fake that with a privacy tool. If you want one honest metric to run cold outreach on, it's reply rate, not open rate.

That said, open tracking isn't useless. It's a rough signal for subject line testing, and if you see zero opens on a campaign you'd otherwise expect to land, it can flag a potential delivery issue worth investigating. Just don't use it as a proxy for genuine engagement.

Not sure which tracking settings make sense for your setup? You're welcome to run it by us at our SOS hotline. Free, no pitch.