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A comment on Show HN: Email Tracker – Find out when and if people view your emails seamlessly. Parent comment

Re:Show HN: Email Tracker – Find out when and if people view... by 27182818284 on Monday November 09, 2015 @12:53PM (#10534536)
You kind of dodged the person's question. What do you use to check that emails are opened?
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Re:Show HN: Email Tracker – Find out when and if people view... by etrackr on Tuesday November 10, 2015 @03:33AM (#10538165)
Sorry. The extension uses a hidden tracking pixel to check if emails get opened.
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