We're launching a new social buying site and one of the many ways of driving traffic to it we're considering is using an opt-in email marketing company like optinemaillist.com. So is email marketing a good idea? We have a budget so money isn't an issue, but will there be results? Also we really don't wanna get labeled as spammers, so we're worried that doing email marketing might get us flagged with ISPs - how do we avoid that? Thanks.