diff --git a/nodemailer/README.md b/nodemailer/README.md
new file mode 100644
index 0000000..81448bd
--- /dev/null
+++ b/nodemailer/README.md
@@ -0,0 +1,6 @@
+```
+docker compose up -d
+# http://localhost:8025 にアクセスして確認
+pnpm i
+node index.mjs
+```
diff --git a/nodemailer/compose.yml b/nodemailer/compose.yml
new file mode 100644
index 0000000..3761cfa
--- /dev/null
+++ b/nodemailer/compose.yml
@@ -0,0 +1,19 @@
+services:
+  # maildev:
+  #   image: maildev/maildev
+  #   ports:
+  #     - "1080:1080" # Web UI
+  #     - "1025:1025"
+  #   environment:
+  #     MAILDEV_INCOMING_USER: postmaster
+  #     MAILDEV_INCOMING_PASS: password
+  mailpit:
+    image: axllent/mailpit
+    ports:
+      - "8025:8025" # Web UI
+      - "1025:1025"
+    environment:
+      MP_SMTP_AUTH_FILE: /etc/mailpit/auth
+      MP_SMTP_AUTH_ALLOW_INSECURE: "true"
+    volumes:
+      - ./etc/mailpit:/etc/mailpit:ro
diff --git a/nodemailer/etc/mailpit/auth b/nodemailer/etc/mailpit/auth
new file mode 100644
index 0000000..7eaaa96
--- /dev/null
+++ b/nodemailer/etc/mailpit/auth
@@ -0,0 +1 @@
+postmaster:password
diff --git a/nodemailer/index.mjs b/nodemailer/index.mjs
new file mode 100644
index 0000000..8ff11e1
--- /dev/null
+++ b/nodemailer/index.mjs
@@ -0,0 +1,20 @@
+import nodemailer from "nodemailer";
+
+const transporter = nodemailer.createTransport({
+  host: "localhost",
+  port: 1025,
+  secure: false,
+  auth: {
+    user: "postmaster",
+    pass: "password",
+  },
+});
+
+const info = await transporter.sendMail({
+  from: "foo <foo@example.com>",
+  to: "bar <bar@example.com>",
+  subject: "Hello world!",
+  html: "<marquee>Hello world.</marquee>",
+});
+
+console.log(info.messageId);
diff --git a/nodemailer/package.json b/nodemailer/package.json
new file mode 100644
index 0000000..f868a31
--- /dev/null
+++ b/nodemailer/package.json
@@ -0,0 +1,15 @@
+{
+  "name": "nodemailer",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "Kohei Watanabe <kou029w@gmail.com>",
+  "license": "MIT",
+  "devDependencies": {
+    "nodemailer": "^6.9.4"
+  }
+}
diff --git a/nodemailer/pnpm-lock.yaml b/nodemailer/pnpm-lock.yaml
new file mode 100644
index 0000000..e1605b0
--- /dev/null
+++ b/nodemailer/pnpm-lock.yaml
@@ -0,0 +1,13 @@
+lockfileVersion: '6.0'
+
+devDependencies:
+  nodemailer:
+    specifier: ^6.9.4
+    version: 6.9.4
+
+packages:
+
+  /nodemailer@6.9.4:
+    resolution: {integrity: sha512-CXjQvrQZV4+6X5wP6ZIgdehJamI63MFoYFGGPtHudWym9qaEHDNdPzaj5bfMCvxG1vhAileSWW90q7nL0N36mA==}
+    engines: {node: '>=6.0.0'}
+    dev: true