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A comment on Show HN: Rebump – Bump Important Emails Until They're Answered. Parent comment

Re:Show HN: Rebump – Bump Important Emails Until They're Ans... by fxthea on Thursday February 27, 2014 @12:38PM (#7313544)
Maybe pixels are placed in the emails?
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Re:Show HN: Rebump – Bump Important Emails Until They're Ans... by matt_vera on Thursday February 27, 2014 @12:47PM (#7313622)
Most likely yes. Same as how Sendgrid and Yesware do it.
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