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Letter Opener is a Ruby development utility that previews outgoing email in a web browser instead of sending it. It helps developers test layouts, content, and delivery behavior without configuring a real mail server or risking accidental messages. In Rails, it works as an Action Mailer delivery method and stores generated messages locally. Developers can customize the storage directory, browser-opening behavior, message template, and file URI scheme. The gem also supports non-Rails setups using Mail, Pony, or Action Mailer directly. Because it relies on a local browser through Launchy, remote servers, containers, and virtual machines may require adjusted settings or alternative mail-preview tools.
Features
- Browser email previews
- Safe local delivery
- Rails Action Mailer integration
- Custom storage location
- Alternate message templates
- Non-Rails support
Project Samples
Categories
EmailLicense
MIT LicenseFollow Letter Opener
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