{"adoption": {"forks": 233, "observed_at": "2026-08-28T04:06:31.283446+00:00", "stars": 2255}, "canonical_url": "https://ross.abutalabs.com/products/lettre", "card": {"archived": false, "artifact_type": "library", "description": "a mailer library for Rust", "domain": ["email", "backend", "developer-tools"], "enriched": true, "function": ["email", "http-client"], "health_score": 97, "homepage": "https://lettre.rs", "language": "Rust", "license": "MIT", "license_family": "permissive", "maturity": "stable", "member_repos": ["lettre/lettre"], "name": "lettre/lettre", "platform": ["rust", "cross-platform"], "pushed_at": "2026-08-03T11:10:09+00:00", "repo": "lettre/lettre", "stars": 2255, "tags": ["smtp", "mailer", "sendmail", "email-builder", "async"], "topics": ["rust", "email", "smtp", "mailer", "sendmail", "mailer-library", "hacktoberfest"], "urls": [], "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"], "what_it_is": "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.", "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"], "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"]}, "data_as_of": "2026-08-30T08:39:29.467469+00:00", "members": [{"path": "/products/lettre", "repo": "lettre/lettre", "role": "main", "score": 92}], "provenance": {"archived": {"kind": "observed", "observed_at": "2026-08-28T04:06:31.283446+00:00", "source": "github"}, "artifact_type": {"confidence": null, "enriched_at": "2026-08-30T02:43:45.322078+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "70db5c1c519cf9dd92a22ced1cbd086a3626dc623c595b9786a3bb193f76c40e", "fetched_at": "2026-08-28T04:06:31.283446+00:00", "kind": "readme", "missing": false, "url": "https://github.com/lettre/lettre"}, {"content_hash": "9f6b3c45c85876f3a4dac51e962eb59bcdc54f6b781b74bd99100012abb01eb4", "fetched_at": "2026-08-29T10:23:42.839700+00:00", "kind": "homepage", "missing": false, "url": "https://lettre.rs"}, {"content_hash": "16ddad7e12ef43e9afb6f572375a2d27711dfcead0285893be64b33a9297e896", "fetched_at": "2026-08-29T10:23:42.842571+00:00", "kind": "registry_crates", "missing": false, "url": "https://crates.io/api/v1/crates/lettre"}], "taxonomy_version": 1}, "description": {"kind": "observed", "observed_at": "2026-08-28T04:06:31.283446+00:00", "source": "github"}, "domain": {"confidence": null, "enriched_at": "2026-08-30T02:43:45.322078+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "70db5c1c519cf9dd92a22ced1cbd086a3626dc623c595b9786a3bb193f76c40e", "fetched_at": "2026-08-28T04:06:31.283446+00:00", "kind": "readme", "missing": false, "url": "https://github.com/lettre/lettre"}, {"content_hash": "9f6b3c45c85876f3a4dac51e962eb59bcdc54f6b781b74bd99100012abb01eb4", "fetched_at": "2026-08-29T10:23:42.839700+00:00", "kind": "homepage", "missing": false, "url": "https://lettre.rs"}, {"content_hash": "16ddad7e12ef43e9afb6f572375a2d27711dfcead0285893be64b33a9297e896", "fetched_at": "2026-08-29T10:23:42.842571+00:00", "kind": "registry_crates", "missing": false, "url": "https://crates.io/api/v1/crates/lettre"}], "taxonomy_version": 1}, "enriched": {"inputs": [], "kind": "computed", "method": "enrichment_status"}, "function": {"confidence": null, "enriched_at": "2026-08-30T02:43:45.322078+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "70db5c1c519cf9dd92a22ced1cbd086a3626dc623c595b9786a3bb193f76c40e", "fetched_at": "2026-08-28T04:06:31.283446+00:00", "kind": "readme", "missing": false, "url": "https://github.com/lettre/lettre"}, {"content_hash": "9f6b3c45c85876f3a4dac51e962eb59bcdc54f6b781b74bd99100012abb01eb4", "fetched_at": "2026-08-29T10:23:42.839700+00:00", "kind": "homepage", "missing": false, "url": "https://lettre.rs"}, {"content_hash": "16ddad7e12ef43e9afb6f572375a2d27711dfcead0285893be64b33a9297e896", "fetched_at": "2026-08-29T10:23:42.842571+00:00", "kind": "registry_crates", "missing": false, "url": "https://crates.io/api/v1/crates/lettre"}], "taxonomy_version": 1}, "health_score": {"inputs": ["days_since_push", "days_since_release", "archived"], "kind": "computed", "method": "health_v1"}, "homepage": {"kind": "observed", "observed_at": "2026-08-28T04:06:31.283446+00:00", "source": "github"}, "language": {"kind": "observed", "observed_at": "2026-08-28T04:06:31.283446+00:00", "source": "github"}, "license": {"kind": "observed", "observed_at": "2026-08-28T04:06:31.283446+00:00", "source": "github"}, "license_family": {"inputs": ["license"], "kind": "computed", "method": "license_family"}, "maturity": {"confidence": null, "enriched_at": "2026-08-30T02:43:45.322078+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "70db5c1c519cf9dd92a22ced1cbd086a3626dc623c595b9786a3bb193f76c40e", "fetched_at": "2026-08-28T04:06:31.283446+00:00", "kind": "readme", "missing": false, "url": "https://github.com/lettre/lettre"}, {"content_hash": "9f6b3c45c85876f3a4dac51e962eb59bcdc54f6b781b74bd99100012abb01eb4", "fetched_at": "2026-08-29T10:23:42.839700+00:00", "kind": "homepage", "missing": false, "url": "https://lettre.rs"}, {"content_hash": "16ddad7e12ef43e9afb6f572375a2d27711dfcead0285893be64b33a9297e896", "fetched_at": "2026-08-29T10:23:42.842571+00:00", "kind": "registry_crates", "missing": false, "url": "https://crates.io/api/v1/crates/lettre"}], "taxonomy_version": 1}, "member_repos": {"kind": "observed", "observed_at": "2026-08-28T04:06:31.283446+00:00", "source": "github"}, "name": {"kind": "observed", "observed_at": "2026-08-28T04:06:31.283446+00:00", "source": "github"}, "platform": {"confidence": null, "enriched_at": "2026-08-30T02:43:45.322078+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "70db5c1c519cf9dd92a22ced1cbd086a3626dc623c595b9786a3bb193f76c40e", "fetched_at": "2026-08-28T04:06:31.283446+00:00", "kind": "readme", "missing": false, "url": "https://github.com/lettre/lettre"}, {"content_hash": "9f6b3c45c85876f3a4dac51e962eb59bcdc54f6b781b74bd99100012abb01eb4", "fetched_at": "2026-08-29T10:23:42.839700+00:00", "kind": "homepage", "missing": false, "url": "https://lettre.rs"}, {"content_hash": "16ddad7e12ef43e9afb6f572375a2d27711dfcead0285893be64b33a9297e896", "fetched_at": "2026-08-29T10:23:42.842571+00:00", "kind": "registry_crates", "missing": false, "url": "https://crates.io/api/v1/crates/lettre"}], "taxonomy_version": 1}, "pushed_at": {"kind": "observed", "observed_at": "2026-08-28T04:06:31.283446+00:00", "source": "github"}, "repo": {"kind": "observed", "observed_at": "2026-08-28T04:06:31.283446+00:00", "source": "github"}, "stars": {"kind": "observed", "observed_at": "2026-08-28T04:06:31.283446+00:00", "source": "github"}, "tags": {"confidence": null, "enriched_at": "2026-08-30T02:43:45.322078+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "70db5c1c519cf9dd92a22ced1cbd086a3626dc623c595b9786a3bb193f76c40e", "fetched_at": "2026-08-28T04:06:31.283446+00:00", "kind": "readme", "missing": false, "url": "https://github.com/lettre/lettre"}, {"content_hash": "9f6b3c45c85876f3a4dac51e962eb59bcdc54f6b781b74bd99100012abb01eb4", "fetched_at": "2026-08-29T10:23:42.839700+00:00", "kind": "homepage", "missing": false, "url": "https://lettre.rs"}, {"content_hash": "16ddad7e12ef43e9afb6f572375a2d27711dfcead0285893be64b33a9297e896", "fetched_at": "2026-08-29T10:23:42.842571+00:00", "kind": "registry_crates", "missing": false, "url": "https://crates.io/api/v1/crates/lettre"}], "taxonomy_version": 1}, "topics": {"kind": "observed", "observed_at": "2026-08-28T04:06:31.283446+00:00", "source": "github"}, "urls": {"kind": "observed", "observed_at": "2026-08-28T04:06:31.283446+00:00", "source": "github"}, "use_cases": {"confidence": null, "enriched_at": "2026-08-30T02:43:45.322078+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "70db5c1c519cf9dd92a22ced1cbd086a3626dc623c595b9786a3bb193f76c40e", "fetched_at": "2026-08-28T04:06:31.283446+00:00", "kind": "readme", "missing": false, "url": "https://github.com/lettre/lettre"}, {"content_hash": "9f6b3c45c85876f3a4dac51e962eb59bcdc54f6b781b74bd99100012abb01eb4", "fetched_at": "2026-08-29T10:23:42.839700+00:00", "kind": "homepage", "missing": false, "url": "https://lettre.rs"}, {"content_hash": "16ddad7e12ef43e9afb6f572375a2d27711dfcead0285893be64b33a9297e896", "fetched_at": "2026-08-29T10:23:42.842571+00:00", "kind": "registry_crates", "missing": false, "url": "https://crates.io/api/v1/crates/lettre"}], "taxonomy_version": 1}, "what_it_is": {"confidence": null, "enriched_at": "2026-08-30T02:43:45.322078+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "70db5c1c519cf9dd92a22ced1cbd086a3626dc623c595b9786a3bb193f76c40e", "fetched_at": "2026-08-28T04:06:31.283446+00:00", "kind": "readme", "missing": false, "url": "https://github.com/lettre/lettre"}, {"content_hash": "9f6b3c45c85876f3a4dac51e962eb59bcdc54f6b781b74bd99100012abb01eb4", "fetched_at": "2026-08-29T10:23:42.839700+00:00", "kind": "homepage", "missing": false, "url": "https://lettre.rs"}, {"content_hash": "16ddad7e12ef43e9afb6f572375a2d27711dfcead0285893be64b33a9297e896", "fetched_at": "2026-08-29T10:23:42.842571+00:00", "kind": "registry_crates", "missing": false, "url": "https://crates.io/api/v1/crates/lettre"}], "taxonomy_version": 1}, "when_to_avoid": {"confidence": null, "enriched_at": "2026-08-30T02:43:45.322078+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "70db5c1c519cf9dd92a22ced1cbd086a3626dc623c595b9786a3bb193f76c40e", "fetched_at": "2026-08-28T04:06:31.283446+00:00", "kind": "readme", "missing": false, "url": "https://github.com/lettre/lettre"}, {"content_hash": "9f6b3c45c85876f3a4dac51e962eb59bcdc54f6b781b74bd99100012abb01eb4", "fetched_at": "2026-08-29T10:23:42.839700+00:00", "kind": "homepage", "missing": false, "url": "https://lettre.rs"}, {"content_hash": "16ddad7e12ef43e9afb6f572375a2d27711dfcead0285893be64b33a9297e896", "fetched_at": "2026-08-29T10:23:42.842571+00:00", "kind": "registry_crates", "missing": false, "url": "https://crates.io/api/v1/crates/lettre"}], "taxonomy_version": 1}, "when_to_choose": {"confidence": null, "enriched_at": "2026-08-30T02:43:45.322078+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "70db5c1c519cf9dd92a22ced1cbd086a3626dc623c595b9786a3bb193f76c40e", "fetched_at": "2026-08-28T04:06:31.283446+00:00", "kind": "readme", "missing": false, "url": "https://github.com/lettre/lettre"}, {"content_hash": "9f6b3c45c85876f3a4dac51e962eb59bcdc54f6b781b74bd99100012abb01eb4", "fetched_at": "2026-08-29T10:23:42.839700+00:00", "kind": "homepage", "missing": false, "url": "https://lettre.rs"}, {"content_hash": "16ddad7e12ef43e9afb6f572375a2d27711dfcead0285893be64b33a9297e896", "fetched_at": "2026-08-29T10:23:42.842571+00:00", "kind": "registry_crates", "missing": false, "url": "https://crates.io/api/v1/crates/lettre"}], "taxonomy_version": 1}}, "score": {"components": {"activity": 95, "longevity": 100, "rhythm": 84}, "computed_at": "2026-09-02T17:46:02.011165+00:00", "flags": [], "formula": "round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)", "inputs": {"age_days": 4594, "days_push": 30, "days_rel": 30, "gap_med": 40, "n_releases_24m": 16}, "score": 92, "version": 2}, "staleness": {"enrichment_outdated": false, "low_confidence": false, "scrape_days": 9, "stale_scrape": false}}