Packages can be downloaded from the release section of the vSMTP github.
vSMTP is published on https://crates.io, meaning it can be install through
cargo install vsmtp
The vSMTP package will be added to the Debian Repository as soon as possible. You can also create your own package using the cargo-deb crate. Scripts and files used to generated the current package are available in the tools/install folder in vSMTP repository.
cargo deb -p vsmtp -v
RPM package will come soon.
Planned for the next release.