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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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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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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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Sup
A curses threads-with-tags style email client (mailing list: supmua@googlegroups.com) (by sup-heliotrope)
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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.
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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From Millions to Billions
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Automated invoicing for remote workers
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Sup: A curses threads-with-tags style email client
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But how to get to that European cloud?
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A note from our sponsor - SaaSHub
www.saashub.com | 12 Jul 2026
Index
What are some of the best open-source Email projects in Ruby? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | Postal | 16,663 |
| 2 | MailCatcher | 6,776 |
| 3 | LetterOpener | 3,841 |
| 4 | 3,672 | |
| 5 | onetimesecret | 2,863 |
| 6 | noticed | 2,697 |
| 7 | premailer-rails | 1,767 |
| 8 | Roadie | 1,348 |
| 9 | Truemail | 1,264 |
| 10 | Ahoy Email | 1,187 |
| 11 | Pony | 1,129 |
| 12 | mailkick | 973 |
| 13 | Sup | 969 |
| 14 | sessy | 898 |
| 15 | MailForm | 871 |
| 16 | heya | 765 |
| 17 | Maily | 708 |
| 18 | MailyHerald | 574 |
| 19 | roadie-rails | 402 |
| 20 | caffeinate | 379 |
| 21 | Maktoub | 309 |
| 22 | Incoming | 308 |
| 23 | clauneck | 197 |
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