GitHubUI Components & Libraries · Email & notification
Self-hosted fake SMTP server with a web UI that captures outgoing mail during local development.
Why it’s a gem
One Go binary, zero config — the fastest way to stop emailing real users from staging
Responsive transactional email templates covering alerts, billing and account lifecycle messages, tested across the major email clients.
React component primitives and 24 prebuilt template categories that render to email-client-safe HTML, plus a local preview server.
Collection of real transactional and lifecycle email copy from well-known products, organised by message type.
Email framework built on golden-ratio typography and a matching vertical rhythm system.
Browser tool that inlines CSS, minifies markup and rewrites URLs for tracking in one pass over an email file.
Strips unused CSS out of HTML emails to stay under Gmail's clipping threshold.