[mladenkovacevic]

Re-engagement for the sake of re-engagement is more or less pointless.... kinda like the acquaintance who calls you just to "check in". Letting me know you still exist doesn't do anything to re-engage me with your service.

Have a strategy before sending me that "re-engagement" email. Why have I become disengaged in the first place? Maybe I wasn't blown away by the workflow your application presented to me. Waiting for me to forget that experience is the perfect opportunity to use me to test a completely different workflow.

Either way, staying top of mind is not about "checking in" every once in a while.. it's about getting your users to depend on your product.