matcornic/hermes

⭐ 2,993  ·  #13  ·  Go

Golang package that generates clean, responsive HTML e-mails for sending transactional mail

Go awesome-go email email-template Awesome

项目分析

🎯 定位	生态资源聚合
💡 核心价值	把散落在 GitHub 各处的 Hermes 相关项目按主题分类整理，附带简介和评价，降低发现门槛
👥 适合谁	刚接触这个方向的开发者，想快速了解有哪些可用的工具、框架、Skills

为什么值得关注

2,993 Stars，处于快速增长阶段，值得早期关注。使用 Go 开发。

AI 深度分析报告

Here is the professional English translation of the provided Chinese text, with all markdown formatting, code blocks, URLs, and technical terms preserved.

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Below is an in-depth analysis report of the GitHub project matcornic/hermes.

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Hermes: An In-Depth Analysis of a Go Transactional Email HTML Template Engine

One-Sentence Summary

A clean solution for Go developers to generate beautiful, responsive email HTML.

Core Features

The core value of Hermes lies in abstracting the complex process of writing email HTML into structured data in Go code, automatically generating inline styles. Its main features include:

1. Structured Email Generation: By defining an Email struct (containing fields such as Body, Header, Intros, Actions, Outros), developers can construct email content like writing JSON, without the need to write HTML manually.
2. Inline CSS Styling: Automatically adds inline styles to generated HTML elements, ensuring consistent rendering across major email clients like Gmail and Outlook, solving the core pain point of CSS compatibility in email clients.
3. Theme Customization: Provides a Hermes configuration struct, allowing developers to customize theme colors, fonts, link colors, etc., to match brand visuals. A clean default theme is included.
4. Plain Text Fallback: In addition to generating the HTML version, Hermes can simultaneously generate a plain text version of the email content, meeting the multi-part MIME format requirements of modern email sending protocols.
5. Template Reusability: Supports writing Markdown content directly in Go code via the Markdown field and rendering it into email HTML, improving the convenience of content creation.

Technical Architecture

• Tech Stack: Implemented purely in Go, with no external runtime dependencies.
• Code Structure Highlights:
  • Core Engine (hermes.go): Defines the Hermes configuration and Email data structure, along with the core methods GenerateHTML() and GeneratePlainText() for generating HTML and plain text.
  • Theme System (theme.go): Defines the abstraction of a theme via an interface, allowing users to implement custom themes. The default theme provides a complete set of style definitions.
  • Template Engine: The project uses Go's standard library html/template and text/template to render emails. It combines the user-defined Email data structure with embedded HTML templates to output the complete email content.
  • CSS Inlining: The project implements a simple CSS inlining logic, writing defined CSS rules directly into the style attribute of corresponding HTML elements, avoiding the dependency on a complex CSS parser.

Quick Start Guide

1. Installation:

   go get -u github.com/matcornic/hermes

2. Usage:

   package main
   
   import (
       "fmt"
       "github.com/matcornic/hermes"
   )
   
   func main() {
       h := hermes.Hermes{
           Product: hermes.Product{
               Name: "My App",
               Link: "https://myapp.com",
               Logo: "https://myapp.com/logo.png",
           },
       }
   
       email := hermes.Email{
           Body: hermes.Body{
               Name: "User",
               Intros: []string{"Welcome to My App!"},
               Actions: []hermes.Action{
                   {
                       Instructions: "Click the button below to get started:",
                       Button: hermes.Button{
                           Color: "#22BC66",
                           Text:  "Confirm your account",
                           Link:  "https://myapp.com/confirm",
                       },
                   },
               },
               Outros: []string{"If you have any questions, feel free to reply."},
           },
       }
   
       emailBody, _ := h.GenerateHTML(email)
       fmt.Println(emailBody)
   }

Strengths, Weaknesses, and Use Cases

Strengths:

• High Development Efficiency: Uses Go structured data to define emails, avoiding the need to write complex and poorly compatible HTML email code manually.
• Out-of-the-Box: Provides a default theme for quick integration, and the generated emails display well in major clients.
• Lightweight with No Dependencies: Pure Go implementation, easy to maintain and integrate into any Go project.
• Dual Output: Generates both HTML and plain text versions, adhering to best practices.

Weaknesses:

• Limited Flexibility: Its structured model may not be flexible enough for extremely complex or highly customized email layouts (e.g., multi-column layouts, complex tables).
• Low Community Activity: The project has not been updated for a considerable time, potentially leaving some edge cases unaddressed or compatibility issues with the latest Go versions.
• Relatively Basic Features: Does not support more advanced features like email previews, A/B testing, or variable substitution (requires manual implementation).

Use Cases:

• Small to Medium-Sized Go Services: Needing to send transactional emails (e.g., registration confirmations, password resets, order notifications) quickly and reliably.
• Startup Teams or Individual Developers: Looking to avoid the complexity of email template development and ship features rapidly.
• Projects with Moderate Styling Requirements: Accepting the default theme or making limited customizations, without needing pixel-perfect rendering.

Community & Popularity

• Stars (2,993): This is a relatively high number, indicating that the project gained significant attention and recognition from Go developers early on, solving a common pain point at the time.
• Forks (Moderate Count): The fork count reflects a certain level of community-driven secondary development and contributions.
• Update Status: Based on the last update date (2026-05-09), this appears to be a future date, which might be an anomaly in project information fetching or display. However, judging from the actual repository commit history, the last substantial commit was approximately 3-4 years ago. This means the project is currently in a stagnant or maintenance mode, not actively developed.

Summary: Hermes is a classic Go library that solved an important problem in its time. Its core idea (structured email generation) remains valuable today. However, due to its long period without updates, new users should assess potential compatibility risks and future maintenance burdens. For projects prioritizing stability and not requiring frequent feature updates, it remains a reliable choice. If you need a more modern and actively maintained alternative, consider exploring the email HTML generation capabilities of projects like go-mail/mail or vanng822/go-premailer.

技术信息

• 💻 语言: Go
• 📂 Topics: awesome-go, email, email-template, email-template-generator, emails
• 🕐 更新: 2026-05-09
• 🔗 访问 GitHub 仓库

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数据更新于 2026-05-09 · Stars 数以 GitHub 实际数据为准