无法使用Javamailserver发送电子邮件，连接被拒绝

Question

我正在尝试从Spring启动应用程序发送电子邮件。这是我的配置属性。

spring:
application:
  name: spring-base-template
profiles:
active: ${env:local}
 mail:
  default-encoding: UTF-8
  host: company.host.name
  username: myusername@domain.com
  password: mypassword
  port: 587
  properties:
    mail:
      smtp:
        auth: true
        starttls:
          enable: true
        socketFactory:
          port: 465
          class: javax.net.ssl.SSLSocketFactory
          fallback: false
  protocol: smtp
  test-connection: false

我的示例代码如下

 try {
        SimpleMailMessage mail = new SimpleMailMessage();
        mail.setTo("myusername@domain.com");
        mail.setFrom("myusername@domain.com");
        mail.setSubject("Registration Confirmation");
        mail.setText("You are registered Successfully! Thank you for being with us!");
        javaMailSender.send(mail);

    } catch(Exception e) {
        e.printStackTrace();
    }

当我尝试发送电子邮件时，以下是例外情况

    org.springframework.mail.MailSendException: Mail server connection failed; nested exception is javax.mail.MessagingException: Could not connect to SMTP host: company.host.name, port: 587;
nested exception is:
java.net.SocketException: Connection reset. Failed messages: javax.mail.MessagingException: Could not connect to SMTP host: company.host.name, port: 587;
nested exception is:
java.net.SocketException: Connection reset; message exception details (1) 
are:
Failed message 1:
javax.mail.MessagingException: Could not connect to SMTP host: 
company.host.name, port: 587;

任何想法都将不胜感激。