How To Run Your Own Mail Server with Mail-in-a-Box on Ubuntu
TUTORIAL Mail-in-a-Box is an open source software bundle that makes it easy to turn your Ubuntu server into a full-stack email solution for multiple domains. For securing the server, Mail-in-a-Box makes use of Fail2ban and an SSL certificate (self-signed by default). It auto-configures a UFW firewall with all the required ports open. Its anti-spam and other security features include graylisting, SPF, DKIM, DMARC, opportunistic TLS, strong ciphers, HSTS, and DNSSEC (with DANE TLSA). Mail-in-a-Box is designed to handle SMTP, IMAP/POP, spam filtering, webmail, and even DNS as part of its all-in-one solution. Since the server itself is handling your DNS, you’ll get an off-the-shelf DNS solution optimized for mail. Basically, this means you’ll get sophisticated DNS records for your email (including SPF and DKIM records) without having to research and set them up manually. You can tweak your DNS settings afterwards as needed, but the defaults should work very well for most users ...