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Zimbra - Zimbra is trusted by over 500 million users to increase productivity with a complete set of collaboration tools while maintaining total control over security and privacy.
TinyCore - Simple operating system based on Linux that uses "modules", and loads everything into RAM. Can be persistent too.
iRedMail - A fully fledged, free email server solution, an open source project (GPL v2).
DietPi - Dietpi is a debian based operative system made to install new apps easyer.
mailcow - An open source mailserver suite.
FatDog64 - FatDog64 is the lightweight 64-bit multi-user Linux distribution.