在应用开发过程中，发送邮件是偶尔遇到的需求，通常邮件的配置会放置在application.yml或者application.properties中，这是一种方式，另一种方式可以放置在Configuration中

邮件配置在application.yml

spring:
  mail:
    host: ********
    username: *******
    password: *******

邮件配置在Configuration中

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.mail.javamail.JavaMailSenderImpl;

@Configuration
public class MailConfig {

    @Bean
    public JavaMailSender getJavaMailSender() {
        JavaMailSenderImpl mailSender = new JavaMailSenderImpl();
        mailSender.setHost("******");
        mailSender.setUsername("******");
        mailSender.setPassword("******");
        return mailSender;
    }
}