Email Newsletter Builder

Email Newsletter Builder

Generate professional HTML email newsletters fully compatible with Gmail, Outlook, Apple Mail, and other major email clients. Uses table-based layout with inline CSS to ensure consistent rendering across all clients.

Use Cases

• Company internal weekly/monthly reports
• Product update announcements
• Marketing and promotional emails
• Event invitations
• Content digests and article roundups

Layout Types (Semantic Tags)

The layout field is a semantic tag indicating the intended purpose of the email, helping you choose the right combination of sections. The actual email structure is determined by the module types in the sections array.

| Layout Tag | Recommended Sections | Best For | |----------|---------------------|----------| | single-column | hero_banner + text + cta | General newsletters, announcements | | two-column | two_column + image_text | Product comparisons, side-by-side image/text | | hero | hero_banner + text + cta | Marketing emails, event invitations | | digest | Multiple article_card | Content digests, article roundups |

Supported Content Modules

| Module Type | Description | |----------|------| | hero_banner | Full-width banner image with optional overlay title text | | text | Plain text paragraph with optional heading | | image_text | Image and text side by side | | cta | Call-to-action button | | divider | Horizontal separator line | | quote | Blockquote | | article_card | Article card (image + title + excerpt + link) | | two_column | Two-column content area |

Workflow

Step 1: Gather User Requirements

Collect the following information from the user:

1. Email purpose: Weekly report? Announcement? Marketing? (Determines layout recommendation)
2. Content structure: What modules are needed? (Headings, body text, images, buttons, etc.)
3. Brand style: Primary color, logo, company name
4. Specific content: Text, image URLs, and button links for each module

Step 2: Generate Configuration File

Based on user requirements, create a JSON configuration file. The format is as follows:

{
  "layout": "single-column",
  "theme": {
    "primary_color": "#2563EB",
    "secondary_color": "#1E40AF",
    "accent_color": "#F59E0B",
    "bg_color": "#F3F4F6",
    "content_bg_color": "#FFFFFF",
    "text_color": "#1F2937",
    "muted_text_color": "#6B7280",
    "font_family": "Arial, Helvetica, sans-serif",
    "max_width": 600
  },
  "header": {
    "logo_url": "",
    "logo_alt": "Company",
    "title": "Newsletter Title",
    "subtitle": ""
  },
  "preheader": "Preview text shown in the inbox list",
  "sections": [
    {
      "type": "text",
      "title": "Section Title",
      "body": "Section content in HTML or plain text."
    }
  ],
  "footer": {
    "company": "Company Name",
    "address": "Company Address",
    "unsubscribe_url": "#",
    "extra_links": [
      {"text": "Website", "url": "#"}
    ]
  }
}

Step 3: Generate HTML

Write the configuration to a temporary JSON file, then run the generation script:

python scripts/generate_newsletter.py --input config.json --output newsletter.html

Step 4: Review and Deliver

1. Provide the generated HTML file path to the user
2. Explain how to preview it in a browser
3. Remind the user to replace any placeholder images and links

Module Configuration Details

hero_banner

{
  "type": "hero_banner",
  "image_url": "https://example.com/hero.jpg",
  "title": "Welcome to Our Newsletter",
  "subtitle": "Monthly updates and insights",
  "overlay_color": "rgba(0,0,0,0.4)"
}

text

{
  "type": "text",
  "title": "Section Heading",
  "body": "Paragraph content. Supports bold, italic, links."
}

image_text

{
  "type": "image_text",
  "image_url": "https://example.com/photo.jpg",
  "image_alt": "Description",
  "image_position": "left",
  "title": "Feature Title",
  "body": "Feature description text.",
  "cta_text": "Learn More",
  "cta_url": "#"
}

cta

{
  "type": "cta",
  "text": "Get Started Now",
  "url": "#",
  "align": "center"
}

divider

{
  "type": "divider",
  "color": "#E5E7EB",
  "spacing": 20
}

quote

{
  "type": "quote",
  "text": "This is a quoted text block.",
  "author": "Author Name"
}

article_card

{
  "type": "article_card",
  "image_url": "https://example.com/thumb.jpg",
  "title": "Article Title",
  "excerpt": "Brief summary of the article...",
  "url": "#",
  "cta_text": "Read More"
}

two_column

{
  "type": "two_column",
  "left": {
    "title": "Left Column",
    "body": "Left content"
  },
  "right": {
    "title": "Right Column",
    "body": "Right content"
  }
}

Email Compatibility Notes

The generated HTML follows these email compatibility best practices:

• Table layout: All structure uses ` instead of ` for Outlook compatibility
• Inline CSS: All styles are applied via style attributes to prevent `` tags from being stripped by email clients
• Web-safe fonts: Defaults to Arial/Helvetica with no dependency on custom fonts
• Fixed width: Email body is fixed at 600px width to fit various screens
• MSO conditional comments: Includes Outlook-specific conditional comments to ensure correct rendering
• Background color compatibility: Uses both bgcolor attributes and background-color styles
• Image handling: All images have explicit width/height and alt text
• Preheader text: Supports inbox preview text

Important Notes

• Images must use external URLs (emails do not support base64-embedded images or relative paths)
• If the user doesn't have images ready, use https://placehold.co/600x300/EEE/333?text=Your+Image as a placeholder
• CTA buttons use a VML-compatible approach to ensure rounded buttons render correctly in Outlook
• The generated HTML can be directly pasted into email marketing tools (Mailchimp, SendGrid, etc.)

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: null0xxx
• Source: null0xxx/kimi-atlas
• License: MIT

Install and usage instructions live in the source repository linked above.