It's really nice for services that don't use newsletter companies or 3rd party mail services. E.g. at Notifo, we are using our own mailservers to send notificat

It's really nice for services that don't use newsletter companies or 3rd party mail services. E.g. at Notifo, we are using our own mailservers to send notification emails, and now we don't have to build our own analytics backend. We've been using the Mixpanel solution since their beta phase, and we've been very happy with it so far.