Spring Boot Tutorial 0/110 lessons ~6 min read Lesson 53“Production-grade backends”

Email Services

Don't run your own SMTP.

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Focus

2 guided sections

Practice signal

Examples included

Career prep

Foundation builder

Introduction

Don't run your own SMTP. Use a transactional email provider (SES, SendGrid, Postmark, Resend) with templates. Spring Boot's JavaMailSender still gets you there.

Informative example

@Service @RequiredArgsConstructor
public class EmailService {
  private final JavaMailSender mailer;
  private final SpringTemplateEngine templates; // Thymeleaf for HTML emails

  @Async
  public void sendWelcome(String to, String name) {
    var ctx = new Context();
    ctx.setVariable("name", name);
    String html = templates.process("email/welcome", ctx);

    var msg = mailer.createMimeMessage();
    var helper = new MimeMessageHelper(msg, true, "UTF-8");
    helper.setTo(to);
    helper.setSubject("Welcome to Acme");
    helper.setText(html, true);
    mailer.send(msg);
  }
}

# application.yml
spring:
  mail:
    host: email-smtp.us-east-1.amazonaws.com
    port: 587
    username: ${SES_USER}
    password: ${SES_PASS}
    properties:
      mail.smtp.starttls.enable: true

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