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I would recommend a transactional email service like Mandrill, but I understand this is additional expense!!
-- Kel_

Did not know Mandrill, thanks for the hint. Indeed that could become pricey soon.
I am also feeling not comfortable to hand out user email addresses to a third service provider.
Most emails are generated through the "notify me on a new marketplace offer" function. Maybe I limit or just shift this function to Unicorn land, that would cut the email traffic by half.