Well. I just attended a private presentation from a popular e-commerce company. They said they were sending 15 emails per months to a customer in average.
That's a lot, but they've tested it and they got more revenues for every email, until that much.
The emails include: Sale confirmation, payment confirmation, recommendation to buy something again, please come back to rate this, discounts, etc... (it's not all spam).
That's a lot, but they've tested it and they got more revenues for every email, until that much.
The emails include: Sale confirmation, payment confirmation, recommendation to buy something again, please come back to rate this, discounts, etc... (it's not all spam).