I can definitely vouch for getting value out of simply tailing a log of new signups or just refreshing our admin of signups every few when we were collecting a

I can definitely vouch for getting value out of simply tailing a log of new signups or just refreshing our admin of signups every few when we were collecting a lot of email address. The ones that look valuable stick out like a sore thumb and emailing them custom content is way more useful than generic gmail accounts.