为什么我不能发送电子邮件？

Question

I am faced with the fact that I can not send an email message. I can not understand the reason. I use Spting Boot 2. The example uses the JavaMailSender class. But you can do without its implementation and the necessary parameters to be specified in the application.properties?

@Configuration
public class MainConfiguration {

    @Bean
    public JavaMailSender getJavaMailSender() {
        JavaMailSenderImpl mailSender = new JavaMailSenderImpl();
        mailSender.setHost("smtp.yandex.ru");
        mailSender.setPort(465);

        mailSender.setUsername("test@yandex.ru");
        mailSender.setPassword("test122223");

        Properties props = mailSender.getJavaMailProperties();
        props.put("mail.transport.protocol", "smtp");
        props.put("mail.smtp.auth", "true");
        props.put("mail.smtp.starttls.enable", "true");
        props.put("mail.debug", "true");
        props.put("mail.smtp.socketFactory.port", "465");
        props.put("mail.smtp.socketFactory.class","javax.net.ssl.SSLSocketFactory");
        //props.put("mail.smtp.timeout", 1000);

        return mailSender;
    }

    @Bean
    public SimpleMailMessage templateSimpleMessage() {
        SimpleMailMessage message = new SimpleMailMessage();
        message.setText("This is the test email template for your email:");
        return message;
    }

}

And after 2 min, i'm have it's error: "javax.mail.MessagingException: Could not connect to SMTP host"

Answer 1

Try to add

spring.mail.properties.mail.smtp.ssl.enable=true

or

props.put("mail.smtp.ssl.enable", "true");

I didn't get why are you using a Configuration class, if you are using spring boot 2 you could just put all the email configuration in your application.properties file:

spring.mail.properties.mail.smtp.auth=true
spring.mail.properties.mail.smtp.starttls.enable=true
spring.mail.properties.mail.smtp.ssl.enable=true
spring.mail.host=smtp.yandex.ru
spring.mail.port=465
spring.mail.username=test@yandex.ru
spring.mail.password=test122223

Answer 2

Try this code:

Intent i = new Intent(Intent.ACTION_SEND);
   i.setType("message/rfc822");
   i.putExtra(Intent.EXTRA_EMAIL  , new String[]{"recipient@example.com"});
   i.putExtra(Intent.EXTRA_SUBJECT, "subject of email");
   i.putExtra(Intent.EXTRA_TEXT   , "body of email");
try{
     startActivity(Intent.createChooser(i, "Send mail..."));
   }
catch (android.content.ActivityNotFoundException ex) {
     Toast.makeText(MyActivity.this, "There are no email clients installed.", 
     Toast.LENGTH_SHORT).show();
   }