email-template-builder – Marketing & SEO skill for AI agents

Email Template Builder

Tier: POWERFUL

Category: Engineering Team

Domain: Transactional Email / Communications Infrastructure

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Overview

Build complete transactional email systems: React Email templates, provider integration, preview server, i18n support, dark mode, spam optimization, and analytics tracking. Output production-ready code for Resend, Postmark, SendGrid, or AWS SES.

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Core Capabilities

• React Email templates (welcome, verification, password reset, invoice, notification, digest)
• MJML templates for maximum email client compatibility
• Multi-provider support with unified sending interface
• Local preview server with hot reload
• i18n/localization with typed translation keys
• Dark mode support using media queries
• Spam score optimization checklist
• Open/click tracking with UTM parameters

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When to Use

• Setting up transactional email for a new product
• Migrating from a legacy email system
• Adding new email types (invoice, digest, notification)
• Debugging email deliverability issues
• Implementing i18n for email templates

---

Project Structure

emails/
├── components/
│   ├── layout/
│   │   ├── email-layout.tsx       # Base layout with brand header/footer
│   │   └── email-button.tsx       # CTA button component
│   ├── partials/
│   │   ├── header.tsx
│   │   └── footer.tsx
├── templates/
│   ├── welcome.tsx
│   ├── verify-email.tsx
│   ├── password-reset.tsx
│   ├── invoice.tsx
│   ├── notification.tsx
│   └── weekly-digest.tsx
├── lib/
│   ├── send.ts                    # Unified send function
│   ├── providers/
│   │   ├── resend.ts
│   │   ├── postmark.ts
│   │   └── ses.ts
│   └── tracking.ts                # UTM + analytics
├── i18n/
│   ├── en.ts
│   └── de.ts
└── preview/                       # Dev preview server
    └── server.ts

---

Base Email Layout

// emails/components/layout/email-layout.tsx
import {
  Body, Container, Head, Html, Img, Preview, Section, Text, Hr, Font
} from "@react-email/components"

interface EmailLayoutProps {
  preview: string
  children: React.ReactNode
}

export function EmailLayout({ preview, children }: EmailLayoutProps) {
  return (
    <Html lang="en">
      <Head>
        <Font
          fontFamily="Inter"
          fallbackFontFamily="Arial"
          webFont={{ url: "https://fonts.gstatic.com/s/inter/v13/UcCO3FwrK3iLTeHuS_nVMrMxCp50SjIw2boKoduKmMEVuLyfAZ9hiJ-Ek-_EeA.woff2", format: "woff2" }}
          fontWeight={400}
          fontStyle="normal"
        />
        {/* Dark mode styles */}
        <style>{`
          @media (prefers-color-scheme: dark) {
            .email-body { background-color: #0f0f0f !important; }
            .email-container { background-color: #1a1a1a !important; }
            .email-text { color: #e5e5e5 !important; }
            .email-heading { color: #ffffff !important; }
            .email-divider { border-color: #333333 !important; }
          }
        `}</style>
      </Head>
      <Preview>{preview}</Preview>
      <Body className="email-body" style={styles.body}>
        <Container className="email-container" style={styles.container}>
          {/* Header */}
          <Section style={styles.header}>
            <Img src="https://yourapp.com/logo.png" width={120} height={40} alt="MyApp" />
          </Section>
          
          {/* Content */}
          <Section style={styles.content}>
            {children}
          </Section>
          
          {/* Footer */}
          <Hr style={styles.divider} />
          <Section style={styles.footer}>
            <Text style={styles.footerText}>
              MyApp Inc. · 123 Main St · San Francisco, CA 94105
            </Text>
            <Text style={styles.footerText}>
              <a href="{{unsubscribe_url}}" style={styles.link}>Unsubscribe</a>
              {" · "}
              <a href="https://yourapp.com/privacy" style={styles.link}>Privacy Policy</a>
            </Text>
          </Section>
        </Container>
      </Body>
    </Html>
  )
}

const styles = {
  body: { backgroundColor: "#f5f5f5", fontFamily: "Inter, Arial, sans-serif" },
  container: { maxWidth: "600px", margin: "0 auto", backgroundColor: "#ffffff", borderRadius: "8px", overflow: "hidden" },
  header: { padding: "24px 32px", borderBottom: "1px solid #e5e5e5" },
  content: { padding: "32px" },
  divider: { borderColor: "#e5e5e5", margin: "0 32px" },
  footer: { padding: "24px 32px" },
  footerText: { fontSize: "12px", color: "#6b7280", textAlign: "center" as const, margin: "4px 0" },
  link: { color: "#6b7280", textDecoration: "underline" },
}

---

Welcome Email

// emails/templates/welcome.tsx
import { Button, Heading, Text } from "@react-email/components"
import { EmailLayout } from "../components/layout/email-layout"

interface WelcomeEmailProps {
  name: "string"
  confirmUrl: string
  trialDays?: number
}

export function WelcomeEmail({ name, confirmUrl, trialDays = 14 }: WelcomeEmailProps) {
  return (
    <EmailLayout preview={`Welcome to MyApp, ${name}! Confirm your email to get started.`}>
      <Heading style={styles.h1}>Welcome to MyApp, {name}!</Heading>
      <Text style={styles.text}>
        We're excited to have you on board. You've got {trialDays} days to explore everything MyApp has to offer — no credit card required.
      </Text>
      <Text style={styles.text}>
        First, confirm your email address to activate your account:
      </Text>
      <Button href={confirmUrl} style={styles.button}>
        Confirm Email Address
      </Button>
      <Text style={styles.hint}>
        Button not working? Copy and paste this link into your browser:
        <br />
        <a href={confirmUrl} style={styles.link}>{confirmUrl}</a>
      </Text>
      <Text style={styles.text}>
        Once confirmed, you can:
      </Text>
      <ul style={styles.list}>
        <li>Connect your first project in 2 minutes</li>
        <li>Invite your team (free for up to 3 members)</li>
        <li>Set up Slack notifications</li>
      </ul>
    </EmailLayout>
  )
}

export default WelcomeEmail

const styles = {
  h1: { fontSize: "28px", fontWeight: "700", color: "#111827", margin: "0 0 16px" },
  text: { fontSize: "16px", lineHeight: "1.6", color: "#374151", margin: "0 0 16px" },
  button: { backgroundColor: "#4f46e5", color: "#ffffff", borderRadius: "6px", fontSize: "16px", fontWeight: "600", padding: "12px 24px", textDecoration: "none", display: "inline-block", margin: "8px 0 24px" },
  hint: { fontSize: "13px", color: "#6b7280" },
  link: { color: "#4f46e5" },
  list: { fontSize: "16px", lineHeight: "1.8", color: "#374151", paddingLeft: "20px" },
}

---

Invoice Email

// emails/templates/invoice.tsx
import { Row, Column, Section, Heading, Text, Hr, Button } from "@react-email/components"
import { EmailLayout } from "../components/layout/email-layout"

interface InvoiceItem { description: string; amount: number }

interface InvoiceEmailProps {
  name: "string"
  invoiceNumber: string
  invoiceDate: string
  dueDate: string
  items: InvoiceItem[]
  total: number
  currency: string
  downloadUrl: string
}

export function InvoiceEmail({ name, invoiceNumber, invoiceDate, dueDate, items, total, currency = "USD", downloadUrl }: InvoiceEmailProps) {
  const formatter = new Intl.NumberFormat("en-US", { style: "currency", currency })

  return (
    <EmailLayout preview={`Invoice ${invoiceNumber} - ${formatter.format(total / 100)}`}>
      <Heading style={styles.h1}>Invoice #{invoiceNumber}</Heading>
      <Text style={styles.text}>Hi {name},</Text>
      <Text style={styles.text}>Here's your invoice from MyApp. Thank you for your continued support.</Text>

      {/* Invoice Meta */}
      <Section style={styles.metaBox}>
        <Row>
          <Column><Text style={styles.metaLabel}>Invoice Date</Text><Text style={styles.metaValue}>{invoiceDate}</Text></Column>
          <Column><Text style={styles.metaLabel}>Due Date</Text><Text style={styles.metaValue}>{dueDate}</Text></Column>
          <Column><Text style={styles.metaLabel}>Amount Due</Text><Text style={styles.metaValueLarge}>{formatter.format(total / 100)}</Text></Column>
        </Row>
      </Section>

      {/* Line Items */}
      <Section style={styles.table}>
        <Row style={styles.tableHeader}>
          <Column><Text style={styles.tableHeaderText}>Description</Text></Column>
          <Column><Text style={{ ...styles.tableHeaderText, textAlign: "right" }}>Amount</Text></Column>
        </Row>
        {items.map((item, i) => (
          <Row key={i} style={i % 2 === 0 ? styles.tableRowEven : styles.tableRowOdd}>
            <Column><Text style={styles.tableCell}>{item.description}</Text></Column>
            <Column><Text style={{ ...styles.tableCell, textAlign: "right" }}>{formatter.format(item.amount / 100)}</Text></Column>
          </Row>
        ))}
        <Hr style={styles.divider} />
        <Row>
          <Column><Text style={styles.totalLabel}

… (full content is in the download package)