Magma by Lavabit is an open source server for hosting secure email. It is designed for the Dark Internet Mail Environment (DIME) and provides end-to-end encryption for secure email communication. Magma supports the DIME encryption standard, ensuring that every facet of the communication, including the body, metadata, and transport layer, is encrypted. It is suitable for both enterprise and individual use, offering a scalable and reliable solution for secure email hosting.