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

		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.