Feature flags of Lettre crate // Lib.rs

Cargo Features

[dependencies]
lettre = { version = "0.11.2", default-features = false, features = ["builder", "mime03", "file-transport", "file-transport-envelope", "sendmail-transport", "smtp-transport", "pool", "rustls-tls", "boring-tls", "async-std1", "async-std1-rustls-tls", "tokio1", "tokio1-native-tls", "tokio1-rustls-tls", "tokio1-boring-tls", "dkim", "tracing", "hostname", "rustls-native-certs"] }

default = builder, hostname, native-tls, pool, smtp-transport

These default features are set whenever lettre is added without default-features = false somewhere in the dependency tree.

builder default

Enables email-encoding and fastrand, mime and quoted_printable and httpdate

httpdate:
builder

Affects lettre::message, transport::Transport.send, transport::AsyncTransport.send…

mime03

Enables mime

file-transport file-transport-envelope?

transports

Enables fs and io-util of optional tokio and uuid

uuid:
file transport

Affects executor::Executor.fs_write, transport::file…

file-transport-envelope = file-transport, serde

Enables serde_json

Affects executor::Executor.fs_read…

sendmail-transport

Enables unstable of optional async-std, process and io-util of optional tokio

Affects transport::sendmail…

smtp-transport default

Enables base64, url, once_cell and socket2, rt, time and net of optional tokio and nom

nom:
smtp-transport

Affects executor::Executor.spawn, executor::Executor.sleep, executor::Executor.connect, executor::SpawnHandle, transport::smtp…

pool default

Enables futures-util

rustls-tls async-std1-rustls-tls? tokio1-rustls-tls?

Enables rustls ^0.21, rustls-pemfile ^1, and webpki-roots ^0.25

Affects tls::TlsVersion…

boring-tls tokio1-boring-tls?

Enables boring

Affects tls::TlsVersion…

async-std1 async-std1-rustls-tls?

async

Enables async-std, async-trait, futures-io, and futures-util

Affects executor::AsyncStd1Executor, file::AsyncFileTransport, transport::AsyncTransport, sendmail::AsyncSendmailTransport, pool::async_impl, stub::AsyncStubTransport…

async-std1-rustls-tls = async-std1, rustls-tls

Enables futures-rustls ^0.24

tokio1 tokio1-boring-tls? tokio1-native-tls? tokio1-rustls-tls?

Enables async-trait, futures-util and tokio and futures-io

futures-io:
async

Affects executor::Tokio1Executor, async_net::AsyncTokioStream, file::AsyncFileTransport, transport::AsyncTransport, sendmail::AsyncSendmailTransport, pool::async_impl, stub::AsyncStubTransport…

tokio1-native-tls = native-tls, tokio1