Postfix is a free and open-source mail transfer agent. It is the most suitable, easy to configure, and widely-used Sendmail programme for a dedicated web server. I’ve a dedicated server hosted by Digital Ocean and the server is configured with LAMP stack. Recently I needed an email with the blogpipers.com domain to verify the domain with Sendgrid – a transactional email platform. So I’ve googled around and found this mailing software as the most suggested one. Then I searched a bit more for the setup and configuration and it seemed very easy to me.