Crate lettre

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Expand description

Lettre is an email library that allows creating and sending messages. It provides:

  • An easy to use email builder
  • Pluggable email transports
  • Unicode support
  • Secure defaults
  • Async support

Lettre requires Rust 1.70 or newer.

§Features

This section lists each lettre feature and briefly explains it. More info about each module can be found in the corresponding module page.

Features with 📫 near them are enabled by default.

§Typed message builder

Strongly typed message builder

  • builder 📫: Enable the Message builder
  • hostname 📫: Try to use the actual system hostname in the Message-ID header

§SMTP transport

Send emails using SMTP

  • smtp-transport 📫: Enable the SMTP transport
  • pool 📫: Connection pool for SMTP transport
  • hostname 📫: Try to use the actual system hostname for the SMTP CLIENTID
§SMTP over TLS via the native-tls crate

Secure SMTP connections using TLS from the native-tls crate

Uses schannel on Windows, Security-Framework on macOS, and OpenSSL on Linux.

  • native-tls 📫: TLS support for the synchronous version of the API
  • tokio1-native-tls: TLS support for the tokio1 async version of the API

NOTE: native-tls isn’t supported with async-std

§SMTP over TLS via the boring crate (Boring TLS)

Secure SMTP connections using TLS from the boring-tls crate

  • boring-tls: TLS support for the synchronous version of the API
  • tokio1-boring-tls: TLS support for the tokio1 async version of the API

NOTE: boring-tls isn’t supported with async-std

§SMTP over TLS via the rustls crate

Secure SMTP connections using TLS from the rustls-tls crate

Rustls uses ring as the cryptography implementation. As a result, not all Rust’s targets are supported.

  • rustls-tls: TLS support for the synchronous version of the API
  • tokio1-rustls-tls: TLS support for the tokio1 async version of the API
  • async-std1-rustls-tls: TLS support for the async-std1 async version of the API

§Sendmail transport

Send emails using the sendmail command

  • sendmail-transport: Enable the sendmail transport

§File transport

Save emails as an .eml file

  • file-transport: Enable the file transport (saves emails into an .eml file)
  • file-transport-envelope: Allow writing the envelope into a JSON file (additionally saves envelopes into a .json file)

§Async execution runtimes

Use tokio or async-std as an async execution runtime for sending emails

The correct runtime version must be chosen in order for lettre to work correctly. For example, when sending emails from a Tokio 1.x context, the Tokio 1.x executor (Tokio1Executor) must be used. Using a different version (for example Tokio 0.2.x), or async-std, would result in a runtime panic.

  • tokio1: Allow to asynchronously send emails using Tokio 1.x
  • async-std1: Allow to asynchronously send emails using async-std 1.x

NOTE: native-tls isn’t supported with async-std

§Misc features

Additional features

  • serde: Serialization/Deserialization of entities
  • tracing: Logging using the tracing crate
  • mime03: Allow creating a ContentType from an existing mime 0.3 Mime struct
  • dkim: Add support for signing email with DKIM

Re-exports§

Modules§

  • address
    Email addresses
  • error
    Error type for email messages
  • messagebuilder
    Provides a strongly typed way to build emails
  • transport
    Transports for sending emails

Structs§

Traits§