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At Browserling and Online Tools, we ran an experiment to see if it was worth sending marketing emails on weekends. It turned out weekends had very good open rates for personal email addresses (@gmail, @yahoo, @hotmail, @outlook, etc) but no open rates for business emails (all other non-@gmail etc addresses). So from now on we're sending marketing emails to businesses only on weekdays but to everyone else we send marketing emails on all days of the week, including Saturdays and Sundays. See you n...