The document discusses how Zivame, an Indian online lingerie store, reduced its email opt-out rate by 39.2% with help from netCORE Email Consultants. NetCORE implemented a frequency management tool that allowed subscribers to choose how often they receive emails and customized the unsubscribe page. This led to a reduction in the unsubscribe rate from 0.51% to 0.31%, retaining more subscribers.