rnwood/smtp4dev
smtp4dev - the fake smtp email server for development and testing observed · 2026-08-28
Health v2 · maintenance only
90/100
- Activity 99
- Release rhythm 73
- Longevity 100
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-02. Adoption (stars, forks) is never an input.
- gap_med: 4.5
- age_days: 5346
- days_rel: 183
- days_push: 8
- n_releases_24m: 19
Adoption not part of the score
3945 stars · 423 forks observed · 2026-08-28
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded
smtp4dev is a fake SMTP email server for development and testing, with a web interface, terminal UI, and REST API. It captures outgoing mail from applications so developers can inspect messages without emailing real recipients.
Use cases
- test email sending locally without spamming real users
- inspect HTML email rendering and compatibility
- capture SMTP traffic during integration tests
- retrieve test emails via IMAP or POP3
- simulate SMTP errors and TLS scenarios
- run a disposable mail server in Docker for CI
When to choose
- you need a full-featured local SMTP catch-all with a web UI
- you want IMAP/POP3 access, multiple mailboxes, or relay rules in a dev mail server
- you need cross-platform or Docker-based email testing
When to avoid
- you need a production mail transfer agent or real mail delivery
- you only need a minimal catch-all with no UI and prefer a tiny daemon
- your stack cannot run .NET
Facets
application · maturity active
http-server email testing developer-tools gui terminal-ui developer-tools email testing self-hosted windows cross-platform self-hosted smtp-server fake-smtp email-testing imap pop3 mail-server dotnet web-interface linux macos docker
1 source
- readme: https://github.com/rnwood/smtp4dev · fetched 2026-08-28 · 3f1cd5ec142c
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| rnwood/smtp4dev | main | 90 |
For agents
Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem