- Email marketing is an effective way to remarket to past customers and visitors to increase retention rates and profits. Top converting websites remarket regularly and have conversion rates around 22.5% compared to the average of 2-3%. - When developing email lists, companies should collect emails from current clients but not purchase lists or promote across lists without justification. The content of emails should be focused on communicating value like new products or discounts and drive people back to the website. - Email titles and content need to be optimized to avoid spam filters by using proper grammar and avoiding all caps or excessive punctuation. Analytics can measure open rates, unsubscribes, clicks and website conversions to improve future email campaigns.