lettre/lettre

Health v2 · maintenance only

Adoption not part of the score

2255 stars · 233 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

lettre is a mailer library for Rust that lets applications compose and send emails via SMTP, sendmail, and other transports. It offers a strongly typed email builder with MIME support, secure SMTP delivery with authentication and encryption, Unicode/internationalized addresses, and async support.

Use cases

• send emails from a Rust application
• send transactional email via SMTP with authentication
• build emails with attachments and embedded images in Rust
• send email asynchronously from a web backend
• send mail through a local sendmail command
• send password reset or notification emails from a Rust service

When to choose

• you need to send (not parse or receive) email from Rust code
• you want a typed, safe email builder with MIME, attachments, and Unicode support
• you need secure SMTP delivery with TLS and credentials out of the box
• you want async email sending in a Rust web service

When to avoid

• you need to parse, read, or receive incoming emails
• you need a full email client with mailbox management (IMAP, folders)
• your project must support Rust versions older than 1.74

Facets

library · maturity stable

email http-client email backend developer-tools rust cross-platform smtp mailer sendmail email-builder async

Member repositories

For agents

markdown · JSON · MCP: product_card(name="lettre/lettre")