Open Tracking
A one-pixel image at the end of the HTML records the first open, with the IP and user agent of the client that fetched it — and repeat opens inside the dedup window are ignored so one reader does not count twice.
Deep Open Intelligence
Common questions, straight answers.
How is an open detected?
A one-pixel image is appended to the HTML at send time. When the mail client loads it, PostFrame records the open with the IP and user agent of the request.
Why are opens sometimes lower or higher than expected?
Some clients block remote images, so those opens are never seen; others, such as Apple Mail with privacy protection, prefetch images and can register an open without a human reading. Treat opens as a signal, not a count of readers.
Does every open create an event?
No. Repeat opens inside the dedup window are ignored so one reader does not inflate the count; the email's status moves to opened on the first pixel load.
Is a pixel added to plain-text emails?
No. Open tracking needs HTML; plain-text messages carry no pixel and report no opens.
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