How to send mail in email format?

Clear Subject: Make the subject line concise and informative.

Professional Greeting: Use “Dear [Title] [Last Name]” unless you have an established relationship.

Concise Body: Keep the content to the point, explaining the purpose early on.

Signature: Include your full name, job title, company, and contact information.

Code:

java

package com.kartik.mail.send;

import java.io.File;

import java.util.Properties;

import javax.activation.DataHandler;

import javax.activation.DataSource;

import javax.activation.FileDataSource;

import javax.mail.BodyPart;

import javax.mail.Message;

import javax.mail.PasswordAuthentication;

import javax.mail.Session;

import javax.mail.Transport;

import javax.mail.internet.InternetAddress;

import javax.mail.internet.MimeBodyPart;

import javax.mail.internet.MimeMessage;

import javax.mail.internet.MimeMultipart;

public class SendInlineImagesInEmails {

public static void sendMail(String htmlContent, String imagePath) {

// Recipient's email ID

String to = "kmandal@gmail.com";

// Sender's email ID

String from = "kmandal@kmical.com";

final String username = "kmandal"; // change accordingly

final String password = "XXXXXXX"; // change accordingly

String host = "XXXXXXXXXX"; // change accordingly

// Set up the SMTP server properties

Properties props = new Properties();

props.put("mail.smtp.auth", "true");

props.put("mail.smtp.starttls.enable", "true");

props.put("mail.smtp.host", host);

props.put("mail.smtp.port", "25");

// Create a session with authentication

Session session = Session.getInstance(props, new javax.mail.Authenticator() {

protected PasswordAuthentication getPasswordAuthentication() {

return new PasswordAuthentication(username, password);

}

});

try {

// Create a default MimeMessage object

MimeMessage message = new MimeMessage(session);

message.setFrom(new InternetAddress(from));

message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));

message.setSubject("Embedded Image Email");

// Create a multipart message for the email content

Multipart multipart = new MimeMultipart("related");

// First part: HTML content

BodyPart messageBodyPart = new MimeBodyPart();

messageBodyPart.setContent(htmlContent, "text/html");

messageBodyPart.setDisposition(BodyPart.INLINE);

multipart.addBodyPart(messageBodyPart);

// Second part: Image attachment

messageBodyPart = new MimeBodyPart();

File emailImage = new File(imagePath);

if (emailImage.exists()) {

DataSource fds = new FileDataSource(emailImage);

messageBodyPart.setDataHandler(new DataHandler(fds));

messageBodyPart.setHeader("Content-ID", "<image>");

multipart.addBodyPart(messageBodyPart);

} else {

System.out.println("Image file not found: " + imagePath);

return;

}

// Combine both parts into the message

message.setContent(multipart);

// Send the message

Transport.send(message);

System.out.println("Sent message successfully....");

} catch (Exception e) {

e.printStackTrace();

throw new RuntimeException(e);

}

public static void main(String[] args) {

// HTML content with image reference

String htmlContent = "<html><body><h1>Hello</h1>"

+ "<img src=\"cid:image\" style=\"display: block; margin-left: auto; margin-right: auto;\" width=\"200\" height=\"200\" />"

+ "</body></html>";

// Call the sendMail method with the HTML content and image path

sendMail(htmlContent, "d:\\chemical\\_Electron.png");

}

The provided Java program is designed to send an email with an inline image. The email is composed using JavaMail API, where the HTML content and the image are embedded directly into the email.

Code Walkthrough:

Setting up email properties: The email configuration, including authentication and SMTP server details, is set up in this section:

java

Properties props = new Properties();

props.put("mail.smtp.auth", "true");

props.put("mail.smtp.starttls.enable", "true");

props.put("mail.smtp.host", host);

props.put("mail.smtp.port", "25");

Here, the host, username, and password need to be replaced with actual SMTP server credentials.

Creating the email: A MimeMessage is created and filled with content (HTML and image) using a multipart MIME structure.

Java

MimeMessage message = new MimeMessage(session);

message.setFrom(new InternetAddress(from));

message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));

message.setSubject("DDDD");

Multipart multipart = new MimeMultipart("related");

Adding the HTML content: The HTML part of the email is added as a BodyPart. This part references the inline image with the cid:image identifier.

Java

BodyPart messageBodyPart = new MimeBodyPart();

messageBodyPart.setContent(data, "text/html");

messageBodyPart.setDisposition(BodyPart.INLINE);

Embedding the image: The image is attached as another BodyPart. It is identified in the HTML by the cid:image header.

java

messageBodyPart = new MimeBodyPart();

File emailImage = new File("d:\\chemical\\_Electron.png");

DataSource fds = new FileDataSource(emailImage);

messageBodyPart.setDataHandler(new DataHandler(fds));

messageBodyPart.setHeader("Content-ID","<image>");

Sending the email: The message is sent using the Transport.send(message) method.

Changes and Improvements:

Dynamic Image Path: The sendMail method now accepts the image path as a parameter, making the program more flexible.
File Existence Check: Added a check to ensure that the file exists before attempting to send it.
Cleaner Main Method: The main method now uses the dynamic htmlContent and passes it to the sendMail method. You can easily adjust the content as needed.