Got bad greeting from SMTP host: smtp.yandex.ru, port: 465, response: [EOF]] with root cause Yandex

Question

I use brand new spring boot project with next Maven dependency

 <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-mail</artifactId>
 </dependency>

Implementation of method

 @Autowired
JavaMailSender emailSender;

@GetMapping("/send")
public String send() {
    SimpleMailMessage message = new SimpleMailMessage();
    message.setFrom("[email protected]");
    message.setTo("[email protected]");
    message.setSubject(null);
    message.setText("Hello World");
    emailSender.send(message);
    return "success send email " + now();
}

application.yml

host: smtp.yandex.ru
username: [email protected]
password: password
port: 465

And receive the next exception

2020-08-03 23:02:35.102 ERROR 21615 --- [nio-8080-exec-1] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.mail.MailSendException: Mail server connection failed; nested exception is javax.mail.MessagingException: Got bad greeting from SMTP host: smtp.yandex.com, port: 465, response: [EOF]. 

Failed messages: javax.mail.MessagingException: Got bad greeting from SMTP host: smtp.yandex.com, port: 465, response: [EOF]; message exceptions (1) are: Failed message 1: javax.mail.MessagingException: Got bad greeting from SMTP host: smtp.yandex.com, port: 465, response: [EOF]] with root cause

But the same code works perfectly with Mailtrap service

According to this link I used not secure 25 port After which I received the next exception

Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.mail.MailSendException: Mail server connection failed; nested exception is com.sun.mail.util.MailConnectException: Couldn't connect to host, port: smtp.yandex.ru, 25; timeout -1;

587 port =

Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.mail.MailAuthenticationException: Authentication failed; nested exception is javax.mail.AuthenticationFailedException: [EOF];

I guess a problem with SSL

Similar issue

Answer 1

This properties help me

spring:
 boot:
   admin:
     mail:
       to: ${spring.mail.username}, [email protected]
       from: ${spring.mail.username} 
 mail:
   host: smtp.yandex.ru
   username: [email protected]
   password: password
   port: 587
   protocol: smtp
   properties:
     "mail.transport.protocol": smtp
     "mail.smtp.auth": true
     "mail.smtp.starttls.enable": true