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更新日2026年2月23日 05:22

Setup transactional email with Resend (production) and Mailpit (local) for auth and notifications. Use this skill when the user says "setup email", "add email", "transactional email", or "auth emails".

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mattwoodco

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Email Setup with Resend + Mailpit

Minimal transactional email system using Resend for production and Mailpit for local development, optimized for auth flows and notifications.

What Gets Created

Core Files

lib/email.ts (or src/lib/email.ts) - Unified email client (auto-switches between Mailpit/Resend)
emails/base-layout.tsx - Shared layout wrapper
emails/auth-code.tsx - 2FA verification codes
emails/magic-link.tsx - Passwordless login
emails/password-reset.tsx - Password reset flow
emails/notification.tsx - Generic notifications

Note: File paths shown use root-level directories (lib/, emails/). If your project uses the src/ directory structure, add src/ prefix to all paths (e.g., src/lib/email.ts).

Prerequisites

Next.js project (supports both src/ and --no-src-dir structures)
Docker stack running (for Mailpit)

Installation

bun add resend react-email @react-email/components

Setup Steps

1. Update tsconfig.json

Ensure your tsconfig.json has proper path mapping:

For projects with src/ directory:

{
  "compilerOptions": {
    "paths": {
      "@/*": ["./src/*"]
    }
  }
}

For projects without src/ directory (--no-src-dir):

{
  "compilerOptions": {
    "paths": {
      "@/*": ["./*"]
    }
  }
}

2. Add Environment Variables

Add to .env.local:

# Email sender
EMAIL_FROM=noreply@example.com

# Production (Resend)
RESEND_API_KEY=re_...

# Local (Mailpit - already in docker stack)
SMTP_HOST=localhost
SMTP_PORT=1025

3. Create Email Client

Create lib/email.ts (or src/lib/email.ts if using src/ directory):

import { Resend } from "resend";
import { render } from "@react-email/components";
import type { ReactElement } from "react";

const isProduction = process.env.NODE_ENV === "production";
const resend = process.env.RESEND_API_KEY ? new Resend(process.env.RESEND_API_KEY) : null;

type SendEmailOptions = {
  to: string | string[];
  subject: string;
  template: ReactElement;
  replyTo?: string;
};

export async function sendEmail(options: SendEmailOptions) {
  const html = await render(options.template);
  const text = await render(options.template, { plainText: true });
  const from = process.env.EMAIL_FROM ?? "noreply@example.com";

  if (isProduction && resend) {
    return resend.emails.send({
      from,
      to: Array.isArray(options.to) ? options.to : [options.to],
      subject: options.subject,
      html,
      text,
      replyTo: options.replyTo,
    });
  }

  // Local: use Mailpit via nodemailer
  const nodemailer = await import("nodemailer");
  const transport = nodemailer.createTransport({
    host: process.env.SMTP_HOST || "localhost",
    port: Number(process.env.SMTP_PORT) || 1025,
    secure: false,
  });

  return transport.sendMail({
    from,
    to: options.to,
    subject: options.subject,
    html,
    text,
  });
}

4. Create Base Layout

Create emails/base-layout.tsx (or src/emails/base-layout.tsx if using src/ directory):

import {
  Body,
  Container,
  Head,
  Html,
  Preview,
  Tailwind,
} from "@react-email/components";
import type { ReactNode } from "react";

type Props = { preview: string; children: ReactNode };

export function BaseLayout({ preview, children }: Props) {
  return (
    <Html>
      <Head />
      <Preview>{preview}</Preview>
      <Tailwind>
        <Body className="bg-zinc-50 font-sans">
          <Container className="mx-auto max-w-[600px] p-8">
            {children}
          </Container>
        </Body>
      </Tailwind>
    </Html>
  );
}

5. Create Auth Templates

Create emails/auth-code.tsx (or src/emails/auth-code.tsx if using src/ directory):

import { Heading, Section, Text } from "@react-email/components";
import { BaseLayout } from "./base-layout";

type Props = { code: string; expiresIn?: string };

export function AuthCodeEmail({ code, expiresIn = "10 minutes" }: Props) {
  return (
    <BaseLayout preview={`Your verification code: ${code}`}>
      <Heading className="text-2xl font-bold text-zinc-900">
        Verification Code
      </Heading>
      <Section className="my-6 rounded-lg bg-zinc-100 p-6 text-center">
        <Text className="m-0 font-mono text-4xl font-bold tracking-widest text-zinc-900">
          {code}
        </Text>
      </Section>
      <Text className="text-zinc-600">
        This code expires in {expiresIn}. If you didn't request this, ignore this email.
      </Text>
    </BaseLayout>
  );
}

Create emails/magic-link.tsx:

import { Button, Heading, Text } from "@react-email/components";
import { BaseLayout } from "./base-layout";

type Props = { url: string; expiresIn?: string };

export function MagicLinkEmail({ url, expiresIn = "15 minutes" }: Props) {
  return (
    <BaseLayout preview="Sign in to your account">
      <Heading className="text-2xl font-bold text-zinc-900">
        Sign In
      </Heading>
      <Text className="text-zinc-600">
        Click the button below to sign in. This link expires in {expiresIn}.
      </Text>
      <Button
        href={url}
        className="rounded-lg bg-zinc-900 px-6 py-3 text-white"
      >
        Sign In
      </Button>
      <Text className="mt-4 text-sm text-zinc-500">
        If the button doesn't work, copy this link: {url}
      </Text>
    </BaseLayout>
  );
}

Create emails/password-reset.tsx:

import { Button, Heading, Text } from "@react-email/components";
import { BaseLayout } from "./base-layout";

type Props = { url: string; expiresIn?: string };

export function PasswordResetEmail({ url, expiresIn = "1 hour" }: Props) {
  return (
    <BaseLayout preview="Reset your password">
      <Heading className="text-2xl font-bold text-zinc-900">
        Reset Password
      </Heading>
      <Text className="text-zinc-600">
        Someone requested a password reset. If this was you, click below.
        This link expires in {expiresIn}.
      </Text>
      <Button
        href={url}
        className="rounded-lg bg-zinc-900 px-6 py-3 text-white"
      >
        Reset Password
      </Button>
      <Text className="mt-4 text-sm text-zinc-500">
        If you didn't request this, ignore this email.
      </Text>
    </BaseLayout>
  );
}

Create emails/notification.tsx:

import { Button, Heading, Text } from "@react-email/components";
import { BaseLayout } from "./base-layout";

type Props = {
  title: string;
  message: string;
  actionUrl?: string;
  actionText?: string;
};

export function NotificationEmail({ title, message, actionUrl, actionText }: Props) {
  return (
    <BaseLayout preview={title}>
      <Heading className="text-2xl font-bold text-zinc-900">{title}</Heading>
      <Text className="text-zinc-600">{message}</Text>
      {actionUrl && (
        <Button
          href={actionUrl}
          className="rounded-lg bg-zinc-900 px-6 py-3 text-white"
        >
          {actionText ?? "View"}
        </Button>
      )}
    </BaseLayout>
  );
}

Usage Examples

Send Auth Code

import { sendEmail } from "@/lib/email";
import { AuthCodeEmail } from "@/emails/auth-code";

await sendEmail({
  to: "user@example.com",
  subject: "Your verification code",
  template: <AuthCodeEmail code="123456" />,
});

Send Magic Link

import { MagicLinkEmail } from "@/emails/magic-link";

await sendEmail({
  to: "user@example.com",
  subject: "Sign in to your account",
  template: <MagicLinkEmail url="https://app.com/auth/verify?token=xyz" />,
});

Send Password Reset

import { PasswordResetEmail } from "@/emails/password-reset";

await sendEmail({
  to: "user@example.com",
  subject: "Reset your password",
  template: <PasswordResetEmail url="https://app.com/reset?token=xyz" />,
});

Send Generic Notification

import { NotificationEmail } from "@/emails/notification";

await sendEmail({
  to: "user@example.com",
  subject: "Welcome!",
  template: (
    <NotificationEmail
      title="Welcome to our platform"
      message="Thanks for signing up!"
      actionUrl="https://app.com/dashboard"
      actionText="Go to Dashboard"
    />
  ),
});

Local Development

Start Docker stack (includes Mailpit):
```
docker compose up -d
```
View sent emails at: http://localhost:8025
All emails sent locally go to Mailpit regardless of recipient

Testing Templates

Preview all templates in browser:

bunx email dev

Opens React Email preview at http://localhost:3000

Integration with Auth

This email setup is ready for auth integration:

better-auth: Use in sendResetPassword and sendVerificationEmail callbacks
NextAuth: Use in custom email provider
Clerk: Use for custom email notifications
Custom auth: Direct integration via sendEmail function

Production Setup

Sign up for Resend
Verify your domain
Get API key (starts with re_)

Add to production environment variables:

RESEND_API_KEY=re_your_key_here
EMAIL_FROM=noreply@yourdomain.com

Extending

To add more templates later:

Create new file in emails/ (or src/emails/)
Use BaseLayout wrapper
Follow existing template patterns
Import and use in your code

Common additions:

Welcome email
Email verification
Account deletion confirmation
Payment receipts
Weekly digests

Troubleshooting

Emails not sending to Mailpit

Check Mailpit is running:
```
docker ps | grep mailpit
```
Verify SMTP port: Check your Mailpit container ports. Some configurations use different ports:
```
docker ps --format "{{.Names}}\t{{.Ports}}" | grep mailpit
```
Common port mappings:
- Default: 1025:1025 (SMTP) and 8025:8025 (Web UI)
- Alternative: 1026:1025 (SMTP) and 8026:8025 (Web UI)
Update your .env.local to match your actual ports:
```
SMTP_PORT=1026  # Use your actual SMTP port
```
Check EMAIL_FROM is set: Ensure .env.local includes:
```
EMAIL_FROM=noreply@example.com
```
View Mailpit UI: Open your browser to the correct port:
- Default: http://localhost:8025
- Alternative: http://localhost:8026

TypeScript errors in email templates

If you see import errors, ensure your tsconfig.json paths match your project structure (@/* should point to ./src/* or ./*).

React Email preview not loading

The preview server may conflict with your Next.js dev server. Use a different port:

bunx email dev --port 3001

name	email
description	Setup transactional email with Resend (production) and Mailpit (local) for auth and notifications. Use this skill when the user says "setup email", "add email", "transactional email", or "auth emails".
author	@mattwoodco
version	2.0.2
created	"2026-01-11T00:00:00.000Z"
updated	"2026-02-13T00:00:00.000Z"
dependencies	["docker"]

name	email
description	Setup transactional email with Resend (production) and Mailpit (local) for auth and notifications. Use this skill when the user says "setup email", "add email", "transactional email", or "auth emails".
author	@mattwoodco
version	2.0.2
created	"2026-01-11T00:00:00.000Z"
updated	"2026-02-13T00:00:00.000Z"
dependencies	["docker"]

email

このリポジトリの他の Skills

このリポジトリの他の Skills

Email Setup with Resend + Mailpit

What Gets Created

Core Files

Prerequisites

Installation

Setup Steps

1. Update tsconfig.json

2. Add Environment Variables

3. Create Email Client

4. Create Base Layout

5. Create Auth Templates

Usage Examples

Send Auth Code

Send Magic Link

Send Password Reset

Send Generic Notification

Local Development

Testing Templates

Integration with Auth

Production Setup

Extending

Troubleshooting

Emails not sending to Mailpit

TypeScript errors in email templates

React Email preview not loading

Email Setup with Resend + Mailpit

What Gets Created

Core Files

Prerequisites

Installation

Setup Steps

1. Update tsconfig.json

2. Add Environment Variables

3. Create Email Client

4. Create Base Layout

5. Create Auth Templates

Usage Examples

Send Auth Code

Send Magic Link

Send Password Reset

Send Generic Notification

Local Development

Testing Templates

Integration with Auth

Production Setup

Extending

Troubleshooting

Emails not sending to Mailpit

TypeScript errors in email templates

React Email preview not loading