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Compiling Stalwart Mail Server from the source has the main advantage that binaries are built with optimizations specific to your hardware which may result in better performance. Another advantage is that you may enable or disable features to suit your needs.

Install Rust

To compile Stalwart Mail Server you need the latest version of Rust. The fastest way to install rust is with rustup. On Unix systems run the following in your terminal, then follow the onscreen instructions

$ curl --proto '=https' --tlsv1.2 -sSf | sh

If you are running Windows 64-bit, download and run rustup‑init.exe, then follow the onscreen instructions.

Clone Repo

Clone the Stalwart Mail Server repository:

$ git clone
$ cd mail-server

Install required dependencies

  • Install protoc:
$ sudo apt-get install protobuf-compiler


Compile Stalwart Mail Server with the default SQLite backend by executing:

$ cargo build --manifest-path=crates/main/Cargo.toml --release

Or, to compile the FoundationDB backend:

$ cargo build --manifest-path=crates/main/Cargo.toml --no-default-features --features foundationdb --release

Once the compilation process is completed, the Stalwart Mail Server binary will be available under target/release/stalwart-mail.