Springboot - Sending Emails

Let's see how we can send emails with the Springboot application.

Dependencies

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-mail</artifactId>
</dependency>

Properties

Open the application.properties file and add the properties shown below. Set the host and port depending on the kind of hosts that you want to use. Then add the sender email address and password. For gmail we have to use an app password which provides a better security by limiting the access scopes and use it.

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

How to create the gmail app password

Log in to the google account -> security -> 2-step verification

Choose the app passwords at the bottom

Enter a name and click 'save'

Coding

Sending Text

@Controller
public class EmailController {

    @Autowired
    private JavaMailSender mailSender;

    @GetMapping("/email")
    public void sendEmail() {
        SimpleMailMessage message = new SimpleMailMessage();
        message.setFrom("<senderEmail@gmail.com>");
        message.setTo("<receiverEmail>");
        String subject = "Subject";
        String content = "Content";
        message.setSubject(subject);
        message.setText(content);
        mailSender.send(message);        
    }
}

Done

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References

Spring Boot Email Sending Tutorial and Code Examples (codejava.net)

Spring Boot Email Sending Tutorial and Code Examples

Sign in with app passwords - Google Account Help

앱 비밀번호로 로그인 - Google 계정 고객센터