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David Leonhardt
    

It is interesting that the most tested element in email marketing is the "subject", since that is the headline. On a poster or in a magazine, that makes sense; you can't test frequency or time of day/ So marketers are used to testing the headline. But I wonder if when it come to emails, could frequency or time-of the day (or week) make more of a difference. I am certainly not dissing the headline, but has anybody studied the relative importance of these factors?