The first example uses TLS, which should be your preferred encryption mechanism. The second example uses SSL.
The only difference between the two mechanisms is the port number, and the mail.smtp.startXXX.enable property.
For SSL use:
port 465mail.smtp.startssl.enable
For TLS use:
port 987mail.smtp.starttls.enable
Get the source on GitHub here
Example 1: Zoho/Gmail with TLS
package com.ritchie.email;
import java.util.Date;
import java.util.Properties;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
public class SendEmailService {
private Logger logger = Logger.getLogger(SendEmailService.class.getName());
public void sendEmail() {
final String GMAIL_HOST = "smtp.gmail.com";
final String ZOHO_HOST = "smtp.zoho.com";
final String TLS_PORT = "897";
final String SENDER_EMAIL = "username@zoho.com";
final String SENDER_USERNAME = "username@zoho.com";
final String SENDER_PASSWORD = "zoho-password";
// protocol properties
Properties props = System.getProperties();
props.setProperty("mail.smtps.host", ZOHO_HOST); // change to GMAIL_HOST for gmail // for gmail
props.setProperty("mail.smtp.port", TLS_PORT);
props.setProperty("mail.smtp.starttls.enable", "true");
props.setProperty("mail.smtps.auth", "true");
// close connection upon quit being sent
props.put("mail.smtps.quitwait", "false");
Session session = Session.getInstance(props, null);
try {
// create the message
final MimeMessage msg = new MimeMessage(session);
// set recipients and content
msg.setFrom(new InternetAddress(SENDER_EMAIL));
msg.setRecipients(Message.RecipientType.TO, InternetAddress.parse("recipient@gmail.com", false));
msg.setSubject("Demo");
msg.setText("Message Sent via JavaMail", "utf-8", "html");
msg.setSentDate(new Date());
// this means you do not need socketFactory properties
Transport transport = session.getTransport("smtps");
// send the mail
transport.connect(ZOHO_HOST, SENDER_USERNAME, SENDER_PASSWORD);
transport.sendMessage(msg, msg.getAllRecipients());
transport.close();
} catch (MessagingException e) {
logger.log(Level.SEVERE, "Failed to send message", e);
}
}
}
Example 2: Zoho/Gmail with SSL
package com.ritchie.email;
import java.util.Date;
import java.util.Properties;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
public class SendEmailService {
private Logger logger = Logger.getLogger(SendEmailService.class.getName());
public void sendEmail() {
final String GMAIL_HOST = "smtp.gmail.com";
final String ZOHO_HOST = "smtp.zoho.com";
final String SSL_PORT = "465";
final String SENDER_EMAIL = "username@zoho.com";
final String SENDER_USERNAME = "username@zoho.com";
final String SENDER_PASSWORD = "zoho-password";
// protocol properties
Properties props = System.getProperties();
props.setProperty("mail.smtps.host", ZOHO_HOST); // change to GMAIL_HOST for gmail // for gmail
props.setProperty("mail.smtp.port", SSL_PORT);
props.setProperty("mail.smtp.startssl.enable", "true");
props.setProperty("mail.smtps.auth", "true");
// close connection upon quit being sent
props.put("mail.smtps.quitwait", "false");
Session session = Session.getInstance(props, null);
try {
// create the message
final MimeMessage msg = new MimeMessage(session);
// set recipients and content
msg.setFrom(new InternetAddress(SENDER_EMAIL));
msg.setRecipients(Message.RecipientType.TO, InternetAddress.parse("recipient@gmail.com", false));
msg.setSubject("Demo");
msg.setText("Message Sent via JavaMail", "utf-8", "html");
msg.setSentDate(new Date());
// this means you do not need socketFactory properties
Transport transport = session.getTransport("smtps");
// send the mail
transport.connect(ZOHO_HOST, SENDER_USERNAME, SENDER_PASSWORD);
transport.sendMessage(msg, msg.getAllRecipients());
transport.close();
} catch (MessagingException e) {
logger.log(Level.SEVERE, "Failed to send message", e);
}
}
}
