SenderEmail

Overview

This project is designed to send emails to multiple users simultaneously to multiple recipients across different email platforms, including Gmail and Outlook.

Features

• Simultaneous Email Sending : Send emails to many recipients in a single action.
• Multi-Client Compatibility : Supports Gmail, Outlook, and other email services.

Technologies Used

languages

• java 21 : The programming language used for developing the application.

framework

• ** Spring Version :** Spring 3.2.8 The framework used to build and run the application.
• Spring Web : Used to implement stateless URLs in web applications.
• aspect : Designed to handle multiple parts of an application, such as logging .
• actuator : using to monitoring application .
• swagger : use to implement documentation to your project

tools

• Maven : The build automation tool used for managing project dependencies and building the application.
• SMTP Server : Sends emails using Google’s SMTP server with your personal email.

tech

• Exeption handler : Provides custom error messages for different types of exceptions in one place.
• ** .env secret management :** use to secret the sensitive information
• yml File : the project use YAML file to handle Configuration

Prerequisites

• java 21
• Maven
• spring boot
• SMTP Server

Before Running the Project

To run the project, you need to configure an email SMTP server. For this demo, we are using Google SMTP.

1- Creating an SMTP Server with Google

1. Go to this link and log in with your Google account.
2. If you are informed that your account is unavailable for this service, follow these steps:
   • Go to your account settings.
   • Enable "2-Step Verification."

This will allow you to create an App Password for your SMTP configuration.

3- after log in with google you tell you "name application "

4- after write name application ( any name )and click create

5- now you must see you APP Passwords

2- Create a .env File for Sensitive Security Information

HOST=smtp.gmail.com
PORT=smtp_port
USERNAME=your_email_address_setup_with_provider
PASSWORD=your_generated_password

the default ports are as follows:

• **Port 587 ** : For TLS/STARTTLS (recommended for most email clients).
• **Port 465 ** : For SSL (less commonly used).

HOST

• If you are using Google SMTP, do not change this value: smtp.gmail.com.

USERNAME & PASSWORD

• USERNAME : Enter the email address you used to create the App Password.
• PASSWORD : Enter the password that you generated above.

3- now you ready to run application

Running the Project

• In this project, I used IntelliJ.
• To run the application, go to the class SenderEmailApplication and click Run.

After Running the Project

How to Interact with the Project

There are two ways to interact with the project to send emails to multiple users:

1. Swagger
2. Postman

In this demo, we will explain how to interact with the project using Swagger .

To access Swagger, use the following link: http://localhost:8080/swagger-ui/index.html#/.

• you will see only one endPoint POST

http://localhost:8080/email/send-email 

This endpoint allows you to send an email to one or more recipients. Here’s how it works:

Request Body

The request body must include the following fields:

• to: List of recipient email addresses .
  • At least one email address is required.
  • Email addresses must follow a valid email format.
• subject: The subject of the email.
  • This field must not be null.
• body: The content of the email.
  • This field must not be null.

Error Handling

If any of the following fields are null or empty:

• to
• subject
• body

The server will return a 400 Bad Request error with an appropriate exception message.

Test Examples

First Test

{
  "body": " this is body",
  "subject": "subject of email",
  "to": [
    "mo********4@gmil.com"
  ]
}

Request

{
  "body": {
    "body": " this is body",
    "subject": "subject of email",
    "to": [
      "mo********4@gmil.com"
    ]
  },
  "message": "Email has been sent successfully ",
  "statusCode": "ACCEPTED"
}

secound test

with body empty

{
  "body": "    ",
  "subject": " this is a subject",
  "to": [
    "mo********4@gmil.com"
  ]
}

Response

{
  "body": null,
  "message": "Error: The body of the email is empty.",
  "statusCode": "BAD_REQUEST"
}

thired test

with subject empty

{
  "body": " this is a body    ",
  "subject": "     ",
  "to": [
    "mo********4@gmil.com"
  ]
}

Response

{
  "body": null,
  "message": "Error: The subject of the email is empty.",
  "statusCode": "BAD_REQUEST"
}

fourth test

with incorrect email structure

{
  "body": " this is a body    ",
  "subject": " this is a subject    ",
  "to": [
    "Team Zero "
  ]
}

Response

{
  "body": null,
  "message": "Error: One or more recipient email addresses are invalid.",
  "statusCode": "BAD_REQUEST"
}