md-to-eml

Convert Markdown to RFC 5322 email (.eml) with inline CSS and CID images

Repositorio: fabioc-aloha/alex-cognitive-architecture
Última actividad en el origen: 26 de abril de 2026 a las 18:45
Idioma detectado de SKILL.md: inglés
Estrellas: 0
Forks: 1

Opciones de instalación

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npx skills add https://github.com/fabioc-aloha/alex-cognitive-architecture --skill md-to-eml

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type	skill
lifecycle	stable
name	md-to-eml
description	Convert Markdown to RFC 5322 email (.eml) with inline CSS and CID images
tier	extended
inheritance	inheritable
applyTo	*/.eml,*/email,/newsletter*
muscle	.github/muscles/md-to-eml.cjs
currency	2026-04-22T00:00:00.000Z

Markdown to Email Conversion

Write in Markdown, send as professional email — works in any email client

Staleness Watch: See EXTERNAL-API-REGISTRY.md for source URLs and recheck cadence

Convert Markdown documents with YAML frontmatter into RFC 5322-compliant .eml files ready for governance, newsletter, and stakeholder communication workflows.

When to Use

Sending formatted content via email clients (Outlook, Thunderbird, etc.)
Newsletter or governance communication from Markdown sources
Generating test emails for review before batch sending
Converting documentation into distributable email format
Creating email templates with consistent branding
Stakeholder updates with embedded charts or diagrams

Supported Formatting

Format	Status	Notes
Headings	✅	H1-H6 with inline styles
Bold/Italic	✅	Standard emphasis
Links	✅	Clickable hyperlinks
Images	✅	CID embedded as attachments
Code blocks	✅	Monospace, gray background
Inline code	✅	Highlighted
Tables	✅	HTML tables with borders
Blockquotes	✅	Indented with border
Lists	✅	Ordered and unordered
Mermaid diagrams	⚠️	Table fallback (no JS in email)
Emoji	✅	Unicode preserved
Horizontal rules	✅	Styled dividers

Feature	Details
YAML frontmatter	Maps to RFC 5322 headers (To, From, Subject, CC, Reply-To)
Email-safe HTML	Inline CSS with table-based layout (no `<style>` blocks)
Mermaid fallback	Diagrams converted to ASCII table representation (email-safe)
CID images	Local images embedded as base64 multipart MIME attachments
Emoji preservation	Subject and body emoji render correctly across clients
Test mode	`--test` flag overrides recipients for safe preview

Option	Default	Description
`--test`	off	Override recipients for safe preview
`--test-to ADDRESS`	frontmatter from	Custom test recipient email
`--inline-images`	off	Embed images as base64 CID attachments
`--debug`	off	Save intermediate HTML for inspection

Field	RFC 5322 Header	Required	Notes
`to`	To	✅	Primary recipient(s), comma-separated
`from`	From	✅	Sender address
`subject`	Subject	✅	Supports emoji
`cc`	Cc	❌	Carbon copy recipients
`reply-to`	Reply-To	❌	Reply address if different from From

Problem	Cause	Solution
"pandoc not found"	pandoc not installed	`winget install pandoc`
Images not showing	CID not supported	Use `--inline-images` flag
Formatting broken	Client strips styles	Use simpler formatting
Large file size	Too many images	Link images instead of embedding
Subject truncated	Too long	Keep under 60 characters
Emoji not showing	Old email client	Use text alternatives

Condition	Verdict	Action
Subject, From, To headers present and correct	Accept	Required fields for valid .eml
Missing or malformed email headers	Reject	Check frontmatter extraction
HTML body renders in Outlook/Gmail preview	Accept	Test in at least one client
Body shows raw HTML tags or broken layout	Reject	Check MIME Content-Type is text/html
Inline images display (CID or base64)	Accept	Verify no external URL references
Images missing or show broken icons	Reject	Embed as base64 or CID attachment
Links are clickable and point to correct URLs	Accept	Spot-check 2-3 links
Mermaid diagrams pre-rendered as inline images	Accept	Raw mermaid syntax is not email-safe
Mermaid diagrams show as code blocks	Reject	Pre-render to PNG before embedding
File opens in default mail client without errors	Accept	Test .eml file import
Total .eml size >5MB	Warning	Compress images or link instead of embed
Plain-text MIME part included as fallback	Accept	Recommended for accessibility

md-to-eml

Opciones de instalación

Revisa los archivos de origen

Markdown to Email Conversion

When to Use

Supported Formatting

Key Features

Markdown to Email Conversion

When to Use

Supported Formatting

Key Features

Usage

Options Reference

Frontmatter Format

Email Client Compatibility

Test Mode Workflow

Mermaid Diagrams in Email

Troubleshooting

Limitations

Requirements

Muscle Script

Conversion Acceptance Decision Table

Related Skills

Client	HTML	Images	Tables	Emoji
Outlook (Windows)	✅	✅ CID	✅	✅
Outlook (Mac)	✅	✅ CID	✅	✅
Gmail (Web)	✅	✅ CID	✅	✅
Apple Mail	✅	✅ CID	✅	✅
Thunderbird	✅	✅ CID	✅	✅
Mobile (iOS/Android)	✅	⚠️ varies	✅	✅

md-to-eml

Datos de origen

Opciones de instalación

Revisa los archivos de origen

Más de este repositorio

Más de este repositorio

Markdown to Email Conversion

When to Use

Supported Formatting

Key Features

Markdown to Email Conversion

When to Use

Supported Formatting

Key Features

Usage

Options Reference

Frontmatter Format

Email Client Compatibility

Test Mode Workflow

Mermaid Diagrams in Email

Troubleshooting

Limitations

Requirements

Muscle Script

Conversion Acceptance Decision Table

Related Skills