Do not rely on it. As the other message says it is trivial to do, but it will un... | Hacker News

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justincormack on Jan 31, 2012 | parent | context | favorite | on: Giving away the secrets of 99.3% email delivery

Do not rely on it. As the other message says it is trivial to do, but it will underrecord by a lot. Measure by actions not opens.

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