By Emmanuel Ezeagbor — EMI Digital Agency, Port Harcourt Here is a scenario that plays out for thousands of Nigerian businesses every single day. A potential customer finds your Instagram page. They love what they see. They follow you. Two weeks later Instagram changes its algorithm and your posts stop showing up in their feed. They forget about you. You lose a warm lead  not because they lost interest but because a platform you do not own and cannot control stood between you and your customer. Now imagine a different scenario. That same potential customer finds your Instagram page but this time, before they leave, they sign up for your email newsletter in exchange for a free resource. Now you have their email address. You own that connection. No algorithm can take it away. You can reach them whenever you choose directly, personally, in their inbox for as long as they stay subscribed. That is the fundamental power of email marketing. And it is why businesses that invest in ...