Decision Workspace
mailrs-smtp-client vs direct_to_mx vs wasm-smtp
Side-by-side comparison of Rust crates
51
mailrs-smtp-client
experimentalv2.0.1
Outbound SMTP client: MX resolution, DANE/STARTTLS, response parsing — async, transport-agnostic primitives for RFC 5321 senders.
52
direct_to_mx
experimentalv0.3.2
Direct-to-MX email delivery with DKIM signing, IPv4 forcing, MX fallback, bulk sending, attachments, DKIM key generation, and DNS verification
52
wasm-smtp
experimentalv0.15.1
Environment-independent SMTP client core for WASM and other constrained runtimes.
Core Metrics
| mailrs-smtp-client | direct_to_mx | wasm-smtp | |
|---|---|---|---|
| Health Score | 51 | 52 | 52 |
| Total Downloads | 177 | 325 | 1.5K |
| 30d Downloads | 0 | 0 | 0 |
| Dependents | 9 | 0 | 139 |
| Releases | 6 | 14 | 16 |
| Last Updated | 45d ago | 50d ago | 64d ago |
| Age | 1m | 4m | 2m |
Health Breakdown
mailrs-smtp-client
Maintenance
11
Quality
15
Community
9
Popularity
3
Documentation
13
direct_to_mx
Maintenance
16
Quality
12
Community
6
Popularity
3
Documentation
15
wasm-smtp
Maintenance
9
Quality
15
Community
12
Popularity
4
Documentation
12
Technical Details
| mailrs-smtp-client | direct_to_mx | wasm-smtp | |
|---|---|---|---|
| Version | 2.0.1 | 0.3.2 | 0.15.1 |
| Stable (≥1.0) | ✓ Yes | ✗ No | ✗ No |
| License | Apache-2.0 OR MIT | MIT | Apache-2.0 |
| Dependencies | 10 | 11 | 7 |
| Crate Size | 59KB | 42KB | 105KB |
| Features | 0 | 0 | 8 |
| Yanked % | 0.0% | 0.0% | 0.0% |
| Edition | 2024 | 2024 | 2024 |
| MSRV | — | 1.85 | 1.85 |
| Owners | 1 | 1 | 1 |
Links
Quick Verdict
- •direct_to_mx leads with a health score of 52/100, but none of the options score above 80.
- •wasm-smtp has the most downloads (1.5K), suggesting wider adoption.
- •wasm-smtp is depended on by 139 crates — strongest ecosystem trust.
- •direct_to_mx, wasm-smtp are pre-1.0 — API may change.