simple-email-client

Simple Email Client

• A JavaFX-based desktop application for sending emails via SMTP protocol. This lightweight email client provides a simple and intuitive interface for composing and sending emails.

Features

• Simple SMTP Connection: Connect to any SMTP server using hostname and port Email Composition: Compose emails with sender, receiver, subject, and message body
• Real-time Status Updates: Get immediate feedback on connection and sending status
• Clean JavaFX Interface: Modern, user-friendly graphical interface
• Error Handling: Robust error handling and user feedback

Technologies used

• JavaFX 21.0.1: GUI framework for the user interface
  • javafx-controls: UI controls (buttons, text fields, etc.)
  • javafx-fxml: FXML support for UI design
  • javafx-graphics: Graphics rendering
• Jakarta Mail 2.0.1: Email sending functionality (SMTP protocol)
• Maven 3.x: Build automation and dependency management
• JUnit 5: Testing framework

Prerequisites

• Papercut SMTP(Required for Testing)
  • Papercut SMTP is a simple SMTP server for testing email functionality locally without actually sending emails to real addresses.
  • Download Papercut
    • Windows: https://github.com/ChangemakerStudios/Papercut-SMTP
  • SMTP server will start on localhost:25 by default

Setup

• Before running on the application:
  • Launch Papercut SMTP
  • Verify it's running on the default port:
  • Papercut: localhost:25
  • Configure SMTP setting in the actual application:
  • Host Name: localhost
  • Port Number: 25
  • Sender: Any email address
  • Receiver: Any email address

Usage

• Connect to SMTP Server

• Enter Host Name: localhost
• Enter Port Number: 25 (or 2525 for smtp4dev)
• Click Connect
• Status should show "Connected"

• Compose Email

• Enter Sender email address
• Enter Receiver email address
• Enter Subject
• Type your Message in the text area

• Send Email

• Click Send button
• Check status for confirmation
• Open Papercut/smtp4dev to view the "sent" email

• Close Connection

• Click Close button when done
• Status should show "Connection Closed"

Testing with Papercut

• Why Use Papercut? Papercut is a local SMTP server that:
  • Captures all outgoing emails without sending them
  • Perfect for development and testing
  • No risk of accidentally sending test emails to real addresses
  • Provides a simple UI to view captured emails
• Viewing Captured Emails
  • Keep Papercut running in the background
  • Send an email using the application
  • Switch to Papercut window
  • You'll see the email appear in the inbox
  • Click on it to view the full email content

Project Structure

Simple-Email/ |---jdeploy/ | |---publish/ | |---package.json | |---README.md | |---jdeploy-bundle/ | |---icon.png | |---jar-runner.jar | |---jdeploy.js | |---Simple-Email-Client.jar |---jdeploy-bundle/ | |---icon.png | |---jar-runner.jar | |---jdeploys.js | |---Simple-Email-Client.jar |---node_modules/ |---target/ | |---Simple-Email-1.0-SNAPSHOT.jar | |---Simple-Email-Client.jar |---src/ | |---main/ | | |---java/ | | | |---legecy/ | | | |---panda/ | | | |---Main.java | | | |---Email/ | | | |---Display.java | | | |---SMTP.java | | |---resources/ | | |---legecy/ | | |---panda/ | | |---styles/ | | |---styles.css | | |---images/ | | |---app.ico | | |---icon.png | |---test/ | |---java/ | |---legecy/ | |---panda/ | |---AppTest.java | |---Email/ | |---SMTPTest.java |---pom.xml |---README.md |---package.json |---package-lock.json

• Key Classes:
  • Main.java: JavaFX application entry point, lauched the GUI
  • Display.java: Contains the UI layout and actions
  • SMTP.java: Handles SMTP protocol communication with the mail server

Troubleshooting

• Common Issues

• "Connection Failed" Error

• Cause: Papercut/SMTP server is not running or wrong port
• Solution: Verify Papercut is running Check the port number (25 for Papercut, 2525 for smtp4dev) Try telnet localhost 25 to test connectivity

• Port Already in Use

• Cause: Another application is using port 25

• Solution: Use a different port (e.g., 2525) Stop other SMTP services Use smtp4dev instead of Papercut

• Getting Help If you encounter issues:

  • Check that all prerequisites are installed
  • Verify Papercut is running
  • Check the status messages in the application

Download

• https://www.jdeploy.com/~simple-email-client

Author

• Josh T. "Legecy Panda" Masunda

Acknowledgements

• JavaFX team for the excellent GUI framework
• Jakarta Mail fofr SMTP functionality
• Papercut team for the testing SMTP server
• Maven community for the build automation

Note

• This application is for educational and testing purposes. For production use with real SMTP servers, additional security features should be implemented.

From me

• Thank you for your support and trust in my abilities. I hope we can work together again.

Contact me

• Github: https://github.com/LegacyPanda
• Facebook: https://www.facebook.com/profile.php?id=100091230646761
• Fiverr: https://www.fiverr.com/users/josh_t_masunda
• Upwork: https://www.fiverr.com/users/josh_t_masunda
• Phone: [phone]
• Website: Coming Soon