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smtp vs lettre vs async-smtp

Side-by-side comparison of Rust crates

Core Metrics

smtplettreasync-smtp
Health Score386552
Total Downloads58.6K8.0M427.9K
30d Downloads29906.3K31.5K
Dependents03.5K104
Releases206117
Last Updated1674d ago170d ago318d ago
Age11y 4m10y 5m6y 4m

Health Breakdown

smtp
Maintenance
4
Quality
14
Community
3
Popularity
6
Documentation
11
lettre
Maintenance
11
Quality
14
Community
20
Popularity
8
Documentation
12
async-smtp
Maintenance
7
Quality
15
Community
13
Popularity
7
Documentation
10

Technical Details

smtplettreasync-smtp
Version0.3.20.11.190.10.2
Stable (≥1.0)✗ No✗ No✗ No
LicenseMITMITMIT OR Apache-2.0
Dependencies94714
Crate Size21KB159KB31KB
Features1253
Yanked %0.0%0.0%0.0%
Edition20212021
MSRV1.74
Owners12 (team)2

Quick Verdict

  • lettre leads with a health score of 65/100, but none of the options score above 80.
  • lettre is depended on by 3.5K crates — strongest ecosystem trust.
  • ⚠ smtp has not been updated in over a year.