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Top 23 Ruby Email Projects
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Project mention: Show HN: Posthorn, self-hosted mail without the mail server | news.ycombinator.com | 2026-05-26
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AppSignal
AppSignal knows why the f*#k it crashed. Stop vibe-debugging. Every exception, every backtrace, grouped so you see patterns, not noise.
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mailview started because I missed letter_opener from the Ruby world. When you're developing a web application, you don't want emails actually being sent - you want to inspect them locally. In Rails, letter_opener handles this beautifully. In Python? The options were less elegant. So I built mailview: add the middleware to your FastAPI or ASGI app, and every outgoing email gets captured and displayed in a clean browser UI at /_mail.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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Truemail
🚀 Configurable framework agnostic plain Ruby 📨 email validator/verifier. Verify email via Regex, DNS, SMTP and even more. Be sure that email address valid and exists.
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Project mention: Sup – A curses threads-with-tags style email client | news.ycombinator.com | 2026-10-09
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Project mention: Show HN: Sessy – Open-source email observability for AWS SES | news.ycombinator.com | 2025-12-30
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MailForm
Send e-mail straight from forms in Rails with I18n, validations, attachments and request information.
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heya
Heya 👋 is a campaign mailer for Rails. Think of it like ActionMailer, but for timed email sequences. It can also perform other actions like sending a text message.
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caffeinate
A Rails engine for drip campaigns/scheduled sequences and periodical support. Works with ActionMailer, and other things.
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Project mention: 7 Game-Changing Free Error Tracking Tools That Will Save Your Sanity in 2026 | dev.to | 2026-03-19
Honeybadger focuses on providing a clean, developer-friendly experience without overwhelming features. Their free tier offers 250 errors per month, which might seem modest, but their efficient error grouping means you'll likely need fewer error quota than with other tools.
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clauneck
A tool for scraping emails, social media accounts, and much more information from websites using Google Search Results.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
Ruby Email discussion
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Sup – A curses threads-with-tags style email client
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Sup: A curses threads-with-tags style email client
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A note from our sponsor - AppSignal
www.appsignal.com | 14 Oct 2026
Index
What are some of the best open-source Email projects in Ruby? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | Postal | 16,859 |
| 2 | MailCatcher | 6,778 |
| 3 | LetterOpener | 3,838 |
| 4 | 3,670 | |
| 5 | onetimesecret | 2,958 |
| 6 | noticed | 2,705 |
| 7 | premailer-rails | 1,766 |
| 8 | Roadie | 1,349 |
| 9 | Truemail | 1,269 |
| 10 | Ahoy Email | 1,195 |
| 11 | Pony | 1,131 |
| 12 | mailkick | 975 |
| 13 | Sup | 972 |
| 14 | sessy | 936 |
| 15 | MailForm | 871 |
| 16 | heya | 766 |
| 17 | Maily | 707 |
| 18 | MailyHerald | 574 |
| 19 | roadie-rails | 404 |
| 20 | caffeinate | 386 |
| 21 | Maktoub | 310 |
| 22 | Incoming | 308 |
| 23 | clauneck | 202 |
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Stop vibe-debugging. Every exception, every backtrace, grouped so you see patterns, not noise.
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