Cargo Features

mail-headers has no features set by default.

[dependencies]
mail-headers = { version = "0.6.6", features = ["serde-impl", "traceing"] }
serde-impl = serde

Enables serde of vec1

traceing

Enables traceing of mail-internals

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.

serde serde-impl?

Affects utils::serde