Decision Workspace
check-if-email-exists vs direct_to_mx vs mailrs-smtp-client
Side-by-side comparison of Rust crates
50
check-if-email-exists
growingv0.11.7
Check if an email address exists without sending any email
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
51
mailrs-smtp-client
experimentalv2.0.1
Outbound SMTP client: MX resolution, DANE/STARTTLS, response parsing — async, transport-agnostic primitives for RFC 5321 senders.
Core Metrics
| check-if-email-exists | direct_to_mx | mailrs-smtp-client | |
|---|---|---|---|
| Health Score | 50 | 52 | 51 |
| Total Downloads | 227.7K | 325 | 177 |
| 30d Downloads | 4.3K | 0 | 0 |
| Dependents | 53 | 0 | 9 |
| Releases | 39 | 14 | 6 |
| Last Updated | 158d ago | 50d ago | 45d ago |
| Age | 6y 8m | 4m | 1m |
Health Breakdown
check-if-email-exists
Maintenance
11
Quality
9
Community
12
Popularity
6
Documentation
12
direct_to_mx
Maintenance
16
Quality
12
Community
6
Popularity
3
Documentation
15
mailrs-smtp-client
Maintenance
11
Quality
15
Community
9
Popularity
3
Documentation
13
Technical Details
| check-if-email-exists | direct_to_mx | mailrs-smtp-client | |
|---|---|---|---|
| Version | 0.11.7 | 0.3.2 | 2.0.1 |
| Stable (≥1.0) | ✗ No | ✗ No | ✓ Yes |
| License | AGPL-3.0 | MIT | Apache-2.0 OR MIT |
| Dependencies | 26 | 11 | 10 |
| Crate Size | 610KB | 42KB | 59KB |
| Features | 0 | 0 | 0 |
| Yanked % | 0.0% | 0.0% | 0.0% |
| Edition | 2018 | 2024 | 2024 |
| MSRV | — | 1.85 | — |
| Owners | 2 | 1 | 1 |
Links
Quick Verdict
- •direct_to_mx leads with a health score of 52/100, but none of the options score above 80.
- •check-if-email-exists has the most downloads (227.7K), suggesting wider adoption.
- •check-if-email-exists, direct_to_mx are pre-1.0 — API may change.