This is a Spring Boot-based Email Sender Application that allows users to send emails through a simple and user-friendly interface. The backend is built with Spring Boot, and the frontend is developed using HTML, CSS, and JavaScript. This project supports Java 17 and integrates with SMTP for sending emails.

• Send emails to any recipient.
• Simple frontend with a lightweight design.
• Secure SMTP authentication.
• Configurable SMTP settings via application.properties.
• Built for Java 17.

EmailSender/
├── src/
│   ├── main/
│   │   ├── java/com/emailsender/
│   │   │   ├── EmailSenderApplication.java       # Main application file
│   │   │   ├── controller/EmailController.java   # REST API controller
│   │   │   ├── service/EmailService.java         # Email sending logic
│   │   ├── resources/
│   │   │   ├── application.properties            # Email configuration
│   │   ├── webapp/
│   │   │   ├── index.html                        # Frontend HTML
│   │   │   ├── styles.css                        # Frontend CSS
├── pom.xml                                       # Maven dependencies

• Java 17 or later installed.
• Maven installed.
• An email account for SMTP (e.g., Gmail, Outlook).

git clone https://github.com/your-username/email-sender.git
cd email-sender

1. Open the src/main/resources/application.properties file.
2. Update the following properties with your email and password:

   spring.mail.host=smtp.gmail.com
   spring.mail.port=587
   spring.mail.username=your-email@gmail.com
   spring.mail.password=your-app-password
   spring.mail.properties.mail.smtp.auth=true
   spring.mail.properties.mail.smtp.starttls.enable=true
           

3. For Gmail:
   • If you use 2FA, create an App Password.
   • If not, enable "Less Secure Apps" in your Google Account settings.

mvn clean install
mvn spring-boot:run

Open your browser and go to:

http://localhost:8080

Fill in the form with the recipient email, subject, and message, then click Send Email.

POST /api/email/send

curl -X POST "http://localhost:8080/api/email/send" \
     -d "to=example@example.com&subject=Hello&body=Test message"

Success:

"Email sent successfully to example@example.com"

Error:

"Error sending email: Authentication failed"

This project is licensed under the MIT License. See the LICENSE file for details.

• Spring Boot Documentation
• Jakarta Mail Documentation
• Google App Password Guide