You can send these to people in your email lists, which could be critical in getting them to revisit your app or download and install it for the first time.
Ungathumela lokhu kubantu abasohlwini lwakho lwe-imeyili, okungase kubaluleke kakhulu ekwenzeni ukuthi bavakashele kabusha uhlelo lwakho lokusebenza noma balilande futhi balifake okokuqala ngqa.