通过25端口发送邮件不安全，改为ssl加密方式发送邮件，比较常见的2中实现类发送邮件如下所示。

1、JavaMailSenderImpl 类

使用该实现类发送邮件，ssl加密使用端口号为465，借助Properties类设置ssl的各种配置。

		SysUserEntity user = userService.getById(fromUserId);JavaMailSenderImpl senderImpl = new JavaMailSenderImpl();Properties props = new Properties();props.put("mail.smtp.auth", "true");senderImpl.setHost(user.getEmailHost());senderImpl.setUsername(user.getEmail());senderImpl.setPassword(user.getEmailPw());senderImpl.setDefaultEncoding("UTF-8");senderImpl.setJavaMailProperties(props);Properties properties = new Properties();//properties.setProperty("mail.debug", "true");//启用调试//properties.setProperty("mail.smtp.timeout", "1000");//设置链接超时//设置通过ssl协议使用465端口发送、使用默认端口（25）时下面三行不需要properties.setProperty("mail.smtp.auth", "true");//开启认证properties.setProperty("mail.smtp.socketFactory.port", "465");//设置ssl端口properties.setProperty("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");senderImpl.setJavaMailProperties(properties);MimeMessage message = senderImpl.createMimeMessage();//true表示需要创建一个multipart messageMimeMessageHelper helper = new MimeMessageHelper(message, true);helper.setFrom(user.getEmail());helper.setTo(to.split(","));helper.setSubject(subject);helper.setText(content + Constant.SIGNATURE_STR, true);senderImpl.send(message);log.info("邮件发送成功");//保存发送日志mailLogEntity.setCreateUserId(Constant.SUPER_ADMIN);mailLogEntity.setCreateUserOrgNo(Constant.SUPER_ADMIN_ORG);mailLogEntity.setSender(user.getEmail());mailLogEntity.setType(Constant.USER_SEND);result = true;

2、JavaMailSender类

网上资料较少，自己记录一下。
修改application.yml文件配置

spring:mail:host: xxx邮件系统服务器域名或Ipport: 465username: xxx账号password: xxxdefault-encoding: UTF-8# 这里填发送邮箱对应的SMTP地址 ,忽略证书,信任域名properties:mail.smtp.ssl.trust: 邮件系统服务器域名或Ipmail.smtp.auth: truemail.smtp.socketFactory.class: javax.net.ssl.SSLSocketFactorymail.smtp.socketFactory.port: 465mail.smtp.starttls.enable: truemail.smtp.starttls.required: true

至于能否都采用第二种方式来实现，没做测试。