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How accurate is open tracking?

The way we track "Opens" is by placing a tiny, transparent graphic at the bottom of your message and whenever that graphic is downloaded from our server, it registers to us that the email was "opened."

We also count any clicks inside an email as opened, even if the images were disabled, so that if a recipient clicks anything inside the email, the email registers as "Opened."

So, it could technically mean that, more recipients may have opened your email than what is displayed in stats, and that it would not have registered in our system, if you happened to send a (a) plain-text email (because we wouldn't be able to attach tracker graphics) or (b) if a recipient, as a common privacy-protection measure, had images disabled in their webmail (meaning they didn't download the tracker graphics.)

It is important to note that some large companies and institutions may not allow the use of tracking "web beacons" and/or may have images blocked, and this too will not show up as "Opens."

However, rest comfortably, that if an email didn't classify as a bounce, it was delivered, but the open rate still might reflect lower due to some tracking barriers.