How to Send Emails in Spring Boot using SMTP or Email API

Spring Boot supports application email functionality through the spring-boot-starter-mail dependency and the JavaMailSender interface, which can be configured with SMTP server credentials and security settings in application.properties. Simple messages can be sent with SimpleMailMessage, while MIME messages enable HTML content, reusable templates with dynamic placeholders, and file attachments through MimeMessage and MimeMessageHelper. The material also describes sending to multiple recipients and personalizing messages with template variables. As alternatives to direct SMTP, it presents third-party email APIs such as Mailtrap, using an HTTP client like OkHttp to submit email requests and access delivery monitoring features, and it provides configuration examples for Mailtrap SMTP and Gmail SMTP.

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