Sending Mail with Spring Boot

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This example sends email through Gmail.

Creating an App Password

If you use two-step verification, create an app password first.

Create an app password

Obtaining Dependency JAR Files

Download Java Mail and the JavaBeans Activation Framework.

Adding Dependencies

build.gradle

dependencies {
    compile 'org.springframework.boot:spring-boot-starter'
+   compile 'org.springframework.boot:spring-boot-starter-mail'
+   compile fileTree(dir: 'libs', include: '*.jar')
}

Folder structure

|-build.gradle
|-libs/
|  |-activation.jar
|  `-javax.mail.jar
`-src/

Writing the Code

application.properties

spring.mail.host=smtp.gmail.com
spring.mail.port=587
spring.mail.username=<Gmail account>
spring.mail.password=<password>
spring.mail.properties.mail.smtp.auth=true
spring.mail.properties.mail.smtp.starttls.enable=true

If you use two-step verification, set an app password. Otherwise, set the normal login password.

Main.java

package sample.springboot;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.mail.MailSender;
import org.springframework.mail.SimpleMailMessage;

@SpringBootApplication
public class Main {

    public static void main(String[] args) {
        try (ConfigurableApplicationContext ctx = SpringApplication.run(Main.class, args)) {
            ctx.getBean(Main.class).sendMail();
        }
    }

    @Autowired
    private MailSender sender;

    public void sendMail() {
        SimpleMailMessage msg = new SimpleMailMessage();

        msg.setFrom("test@mail.com");
        msg.setTo("recipient email address");
        msg.setSubject("Send mail from Spring Boot");
        msg.setText("You can send mail from Spring Boot.");

        this.sender.send(msg);
    }
}

Checking the Result

Open the recipient mailbox and check the delivered message.