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name: email-newsletter-builder description: "Generate professional HTML email newsletters compatible with Gmail and Outlook. Creates table-based layouts with inline CSS for reliable rendering. Use it when asked to "build a newsletter," "create an email template," or draft a marketing, internal, or digest email." license: MIT type: tool

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 <b>bold</b>, <i>italic</i>, <a href='#'>links</a>."
}

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 <table> instead of <div> for Outlook compatibility
• Inline CSS: All styles are applied via style attributes to prevent <style> 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.)