Cargo Features
decon-spf has no features set by default.
[dependencies]
decon-spf = { version = "0.2.7", features = ["warn-dns", "strict-dns", "serde"] }
Features from optional dependencies
In crates that don't use the dep:
syntax, optional dependencies automatically become Cargo features. These features may have been created by mistake, and this functionality may be removed in the future.