Send email campaigns for free with this self-hosted mail server

Whether you're a freelancer cold-emailing leads to convert them into potential clients, or you're a business that sends out marketing campaigns, the easiest way to automate such emails is by using a mailing client. Over the past few months, I've tried several mail servers for sending out bulk emails. Apart from writing articles like these, I've also taken up a marketing role on the side, so I need to send out frequent campaigns. Most mail servers I've tried are clunky, lack features, or require a pricey subscription. So, instead of using a random server on the internet, I decided to self-host my own mail server on my home network.