I'm launching a new website soon giving away free software go help people grow their online businesses and I'd like get everyone's feedback on their preferred method of email list building. Opt-out - where the user enters their email to get something for free and in the small print they're subscribed to your list then have the option to opt out. Opt-in - user has to tick a box that basically says I want to be subscribed to your email list. Obviously opt-out will grow many times faster but I'm worried about spam reports then inboxing? Anyone got any experience with opt-out?