docs: update README for clarity and improved setup instructions

Author: chiol

README.md

@@ -2,7 +2,32 @@
 
 ![cover image](./assets/cover.png)
 
-ABC User Feedback is a standalone web application that manages Voice of Customer (VoC) data. It allows you to gather and sort feedback from your customers. The product is being applied and used in services worth 10 million MAU.
+ABC User Feedback is a standalone web application designed to manage Voice of Customer (VoC) data. It enables you to efficiently gather and categorize customer feedback. The application is currently utilized in services with a reach of 10 million MAU.
+
+## Quick Start
+
+To quickly set up and run the application locally, follow these steps:
+
+1. **Clone the Repository**:
+
+   ```bash
+   git clone https://github.com/line/abc-user-feedback
+   cd abc-user-feedback
+   ```
+
+2. **Install Dependencies**:
+
+   ```bash
+   pnpm install
+   ```
+
+3. **Start the Application**:
+   ```bash
+   npx auf-cli init
+   npx auf-cli start
+   ```
+
+For more detailed setup instructions, refer to the [Getting Started](#getting-started) section.
 
 <p align="center">
   <video src="https://github.com/user-attachments/assets/a2ef7a1a-41ec-4cec-b7d1-bda5fbd7d48b" width="100%" />
@@ -34,30 +59,30 @@ ABC User Feedback is a standalone web application that manages Voice of Customer
 
 ## Getting Started
 
-The frontend is built with NextJS and the backend is built with NestJS. We provide Docker images for fast and easy setup.
+The frontend is built with Next.js and the backend with NestJS. We provide Docker images for a fast and easy setup.
 
 ### System Requirements
 
-:bulb: Before you begin, make sure you have the following installed:
+Before you begin, ensure you have the following installed:
 
-**Required**
+**Required**:
 
 - [Node.js v22 or above](https://nodejs.org/en/download/)
 - [Docker](https://docs.docker.com/desktop/)
 - [MySQL v8](https://www.mysql.com/downloads/)
 
-**Optional**
+**Optional**:
 
 - SMTP - for mail verification during making accounts
 - [OpenSearch v2.16](https://opensearch.org/) - for performance on searching feedback
 
-You can use [docker-compose.infra-amd64.yml](/docker/docker-compose.infra-amd64.yml) file for requirements.
+You can use the [docker-compose.infra-amd64.yml](/docker/docker-compose.infra-amd64.yml) file for requirements.
 
-for arm architecture, use [docker-compose.infra-arm64.yml](/docker/docker-compose.infra-arm64.yml) file
+For ARM architecture, use the [docker-compose.infra-arm64.yml](/docker/docker-compose.infra-arm64.yml) file.
 
 ### Docker Hub Images
 
-We publish two images to https://hub.docker.com at every release.
+We publish two images to Docker Hub at every release:
 
 #### [Web Admin Frontend](https://hub.docker.com/r/line/abc-user-feedback-web)
 
@@ -71,103 +96,93 @@ docker pull line/abc-user-feedback-web
 docker pull line/abc-user-feedback-api
 ```
 
-## Configuration
-
-### Frontend
-
-:point_right: [Go to Frontend README](./apps/web/README.md)
-
-You can configure the frontend for session password, maximum time span to query, etc.
-
-### Backend
-
-:point_right: [Go to Backend README](./apps/api/README.md)
-
-You can configure the backend for MySQL, SMTP for email verification, OpenSearch-powered improved search experience, etc.
-
-## Integration
-
-If you want to integrate ABC User Feedback with your service, you can use the following features:
-
-1. RESTful Web API - [API document page](https://line.github.io/abc-user-feedback).
-1. Accept images from user - [S3 Integration](./GUIDE.md#image-storage-integration).
-1. Webhooks - [Webhook specification](./GUIDE.md#Webhook-Feature).
-
 ## Development
 
-### Setup Dev Environment using Command Line Tool without Dependencies
+### Setup Dev Environment using Command Line Tool
 
-ABC User Feedback supports a command line tool(`auf-cli`) that easily runs both the frontend and backend.
+ABC User Feedback supports a command line tool (`auf-cli`) that easily runs both the frontend and backend.
 
-With this command line tool, you can initialize the infrastructure and run the app powered by a pre-configured Docker image. Since the CLI is executable with `npx`, only an `npm` environment is required, and no other dependencies are necessary.
+With this tool, you can initialize the infrastructure and run the app using a pre-configured Docker image. Since the CLI is executable with `npx`, only an `npm` environment is required, with no additional dependencies.
 
 ```bash
 npx auf-cli init # initialize infrastructure
 npx auf-cli start # start app
 npx auf-cli stop # stop app
 ```
 
-Please refer to the following npm package site: https://www.npmjs.com/package/auf-cli
+Refer to the [npm package site](https://www.npmjs.com/package/auf-cli) for more details.
 
-### Setup Dev Environment Manually (Local)
+### Manual Setup (Local)
 
-ABC User Feedback is using a monorepo (powered by [TurboRepo](https://turbo.build/)) with multiple apps and packages.
+ABC User Feedback uses a monorepo (powered by [TurboRepo](https://turbo.build/)) with multiple apps and packages.
 
-Follow the instructions below to set up a local development environment.
+Follow these instructions to set up a local development environment:
 
-1. Clone the repository and install dependencies:
+1. **Clone the Repository and Install Dependencies**:
 
 ```bash
 git clone https://github.com/line/abc-user-feedback
 cd abc-user-feedback
 pnpm install
 ```
 
-2. Spin up all required infrastructure (Mysql, OpenSearch, etc.) using Docker Compose:
+2. **Spin Up Required Infrastructure** (MySQL, OpenSearch, etc.) using Docker Compose:
 
 ```bash
 docker-compose -f docker/docker-compose.infra-amd64.yml up -d
 ```
 
-3. Make an `.env` file in `apps/api` and `apps/web` by referring to `.env.example` ([web environment variables](./apps/web/README.md), [api environment variables](./apps/api/README.md))
+3. **Create `.env` Files** in `apps/api` and `apps/web` by referring to `.env.example` ([web environment variables](./apps/web/README.md), [api environment variables](./apps/api/README.md)).
 
-4. Apply database migrations:
+4. **Apply Database Migrations**:
 
 ```bash
 cd apps/api
 npm run migration:run
 ```
 
-5. To start developing, run the `dev` target of both of apps in root directory:
+5. **Start Developing**: Run the `dev` target of both apps in the root directory:
 
 ```bash
 pnpm dev
 ```
 
-6. Also, you can run the `dev` target of one of apps in root directory:
-
-```bash
-# web
-pnpm dev:web
-
-# api
-pnpm dev:api
-```
-
 ### Build Docker Image
 
-For your code build, you can build docker image using docker-compose. Please refer to [remote caching](https://turbo.build/repo/docs/core-concepts/remote-caching) and [deploying with docker](https://turbo.build/repo/docs/handbook/deploying-with-docker) using `turborepo`.
+For your code build, you can build a Docker image using Docker Compose. Refer to [remote caching](https://turbo.build/repo/docs/core-concepts/remote-caching) and [deploying with Docker](https://turbo.build/repo/docs/handbook/deploying-with-docker) using `turborepo`.
 
 ```
 docker compose -f docker-compose.yml build
 ```
 
-Then, run docker-compose
+Then, run Docker Compose:
 
 ```
 docker compose -f docker-compose.yml up -d
 ```
 
+## Configuration
+
+### Frontend
+
+:point_right: [Go to Frontend README](./apps/web/README.md)
+
+You can configure the frontend for session password, maximum time span to query, etc.
+
+### Backend
+
+:point_right: [Go to Backend README](./apps/api/README.md)
+
+You can configure the backend for MySQL, SMTP for email verification, OpenSearch-powered improved search experience, etc.
+
+## Integration
+
+If you want to integrate ABC User Feedback with your service, you can use the following features:
+
+1. RESTful Web API - [API document page](https://line.github.io/abc-user-feedback).
+1. Accept images from user - [S3 Integration](./GUIDE.md#image-storage-integration).
+1. Webhooks - [Webhook specification](./GUIDE.md#Webhook-Feature).
+
 ## Contributing Guidelines
 
 Please follow the [contributing guidelines](./CONTRIBUTING.md) to contribute to the project.

apps/api/src/configs/modules/mailer-config/mailer-config.module.ts

@@ -25,28 +25,19 @@ import type { ConfigServiceType } from '@/types/config-service.type';
     MailerModule.forRootAsync({
       inject: [ConfigService],
       useFactory: (configService: ConfigService<ConfigServiceType>) => {
-        const {
-          host,
-          password,
-          port,
-          username,
-          sender,
-          tls,
-          cipherSpec,
-          opportunisticTLS,
-        } = configService.get('smtp', { infer: true }) ?? {};
+        const { host, password, port, username, sender } =
+          configService.get('smtp', { infer: true }) ?? {};
         return {
           transport: {
             host,
             port,
-            tls: { ciphers: cipherSpec },
+            tls: { ciphers: 'SSLv3' },
             auth:
               username && password ?
                 { user: username, pass: password }
               : undefined,
-            secure: tls,
+            secure: port === 465,
             pool: true,
-            opportunisticTLS,
           },
           defaults: { from: `"User feedback" <${sender}>` },
           template: {