I used to work for a flash sales website, and whenever I told people about it, they'd uniformly say "Oh yeah, I've signed up for them! Way too many emails, can

I used to work for a flash sales website, and whenever I told people about it, they'd uniformly say "Oh yeah, I've signed up for them! Way too many emails, can you make it stop?" You recognise that emails from a flash sales website are vastly different than those from a service you're trying out, right? One is about "Hey, buy X and Y today!" and the other "Hey, here's a cool feature in the product you're trying out!" Not all emails are born equal.