ryanb/letter_opener
Some data may be outdated — see provenance labels.
Preview mail in the browser instead of sending. observed · 2026-09-27
Health v2 · maintenance only
64/100
- Activity 71
- Release rhythm 35
- Longevity 100
Flags: no_releases
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-10-21. Adoption (stars, forks) is never an input.
- gap_med: n/a
- age_days: 5522
- days_rel: n/a
- days_push: 178
- n_releases_24m: 0
Adoption not part of the score
3838 stars · 245 forks observed · 2026-09-27
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded
A Ruby gem that intercepts outgoing email in development and previews it in the browser instead of sending it. It integrates with Rails ActionMailer, the Mail gem, and Pony as a custom delivery method.
Use cases
- preview emails in browser during rails development
- avoid accidentally sending test emails to real users
- test actionmailer emails without an smtp server
- inspect email content and metadata locally
- set up mail delivery for a non-rails ruby app
When to choose
- you develop Rails or Ruby apps and need safe local email previews
- you want zero-config email testing without external services
- you run your app locally and can open a browser
When to avoid
- your app runs on a remote staging server or VM with no local browser
- you need to test actual SMTP delivery behavior
- you need shared team access to sent test emails
Facets
library · maturity stable
email developer-tools testing web-development developer-tools email ruby cross-platform rails action-mailer email-preview development-environment mail-gem
1 source
- readme: https://github.com/ryanb/letter_opener · fetched 2026-09-27 · 169c3f5a1823
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| ryanb/letter_opener | main | 64 |
For agents
markdown · JSON · MCP: product_card(name="ryanb/letter_opener")
Data as of 2026-10-19T08:05:51.212177+00:00 · Report a problem