wtf is proxmox-mail-arm64?

proxmox-mail-arm64 is a build script for creating ARM64 versions of Proxmox Mail Gateway, a mail filtering appliance that officially only ships for standard Intel and AMD processors. This project lets people running ARM based servers, such as certain cloud instances or ARM hardware, build and install the same packages themselves. The simplest way to use it is to download unofficial, pre-built Debian packages from the project's GitHub releases page, either by hand or by running the build script with an install or download option, optionally pointing at a specific version number. For anyone who wants to compile everything from source instead, the README lists the system packages that need installing first, plus the Rust programming language toolchain, since parts of Proxmox Mail Gateway are written in Rust. Running the main build script after that takes about ten minutes and leaves the finished package files in a local folder. There is also a Docker based option: running a docker buildx command with the ARM64 platform flag builds the packages inside a container and copies the finished files out to a local folder once done, without needing to install any build tools directly on your own machine. The build script accepts extra options too, including a debug mode that saves the entire build log to a file for troubleshooting. Once the packages are built or downloaded, installing them uses the normal apt install command, pointed at the folder containing the downloaded or freshly built files. The README notes a related Docker container project from a different author that packages the same software for people who would rather run it as a container from the start. The README includes a disclaimer that Proxmox is a trademark of its own company and that this project is not affiliated with, sponsored by, or endorsed by that company.