[Spring Boot] Send HTML email with attachment using Thymeleaf template

Thymeleaf provides a powerful and easy to use template engine that is effortlessly integrated in Spring and Spring Boot projects.

In this example we look at how to send HTML emails with attachments using a Thymeleaf template from a Spring Boot 2 project.

First of all these are the imports we need to add:

org.springframework.boot:spring-boot-starter-mail
org.springframework.boot:spring-boot-starter-thymeleaf