Decision Workspace
mailrs-shield vs mailrs-dnsbl vs lettre
Side-by-side comparison of Rust crates
57
mailrs-shield
experimentalv1.0.4
SMTP anti-spam primitives: DNS blocklist (DNSBL) queries, greylisting policy with optional Redis store, and PTR / forward-confirmed reverse DNS (FCrDNS) checks.
51
mailrs-dnsbl
experimentalv1.0.0
RFC 5782 DNS-based blocklist lookup. Reverse-IPv4 + zone query + Spamhaus return-code interpretation + in-process TTL cache (positive + negative). Pairs with hickory-resolver for the DNS layer.
73
lettre
growingv0.11.22
Email client
Core Metrics
| mailrs-shield | mailrs-dnsbl | lettre | |
|---|---|---|---|
| Health Score | 57 | 51 | 73 |
| Total Downloads | 79 | 23 | 10.3M |
| 30d Downloads | 0 | 0 | 1.3M |
| Dependents | 0 | 1 | 4.6K |
| Releases | 5 | 1 | 64 |
| Last Updated | 3d ago | 3d ago | 11d ago |
| Age | 5d | 3d | 10y 7m |
Health Breakdown
mailrs-shield
Maintenance
19
Quality
17
Community
6
Popularity
2
Documentation
13
mailrs-dnsbl
Maintenance
13
Quality
16
Community
7
Popularity
2
Documentation
13
lettre
Maintenance
19
Quality
14
Community
20
Popularity
8
Documentation
12
Technical Details
| mailrs-shield | mailrs-dnsbl | lettre | |
|---|---|---|---|
| Version | 1.0.4 | 1.0.0 | 0.11.22 |
| Stable (≥1.0) | ✓ Yes | ✓ Yes | ✗ No |
| License | Apache-2.0 OR MIT | Apache-2.0 OR MIT | MIT |
| Dependencies | 6 | 3 | 46 |
| Crate Size | 34KB | 27KB | 161KB |
| Features | 2 | 0 | 26 |
| Yanked % | 0.0% | 0.0% | 0.0% |
| Edition | 2024 | 2024 | 2024 |
| MSRV | — | — | 1.85 |
| Owners | 1 | 1 | 2 (team) |
Links
Quick Verdict
- •lettre leads with a health score of 73/100, but none of the options score above 80.
- •lettre is depended on by 4.6K crates — strongest ecosystem trust.
- •lettre is pre-1.0 — API may change.