我通过spring批处理使用spring邮件smtp发送电子邮件。发送每封邮件至少需要1秒。我们每批工作将发送1000封邮件。由于每封邮件只有1秒的时间，所以发送1000多封邮件似乎要花很多时间。因此，我计划使用多线程来发送一大块（大小=100）工作中的所有电子邮件。我用这种方法成功地发了一点邮件。
只要邮件总数非常小，多线程就可以工作，比如每批40封电子邮件（甚至不包括块的大小）。如果邮件计数超过smtp抛出的计数 java.net.sockettimeoutexception read timed out . 即使增加超时也不起作用。但是当我不使用多线程发送邮件时，它们工作得非常好。
应用程序属性

spring.mail.properties.mail.smtp.auth=false

spring.mail.properties.mail.smtp.ehlo=false
spring.mail.properties.mail.smtp.ssl.enable=false
spring.mail.properties.mail.smtp.ssl.checkserveridentity=false
spring.mail.properties.mail.debug=false

spring.mail.properties[mail.smtp.connectiontimeout]=10000
spring.mail.properties[mail.smtp.timeout]=10000
spring.mail.properties[mail.smtp.writetimeout]=10000
spring.mail.properties[mail.mime.charset]=UTF-8

作家

@Autowired
    EmailSender emailSender;

    ExecutorService executor = Executors.newCachedThreadPool();
    Collection<Callable<Map<BBEmailOutreach, Boolean>>> tasks = new ArrayList<>();

    items.stream().filter(item -> item != null).forEach(item -> {
       tasks.add(new ParallelMail(item, emailSender));
    }

    try {
        futureMailStatus = executor.invokeAll(tasks);
    } catch (InterruptedException e) {
        e.printStackTrace();
    }

电子邮件发送者.java

public class EmailSender {

    @Autowired
    private JavaMailSender javaMailSender;

    public void sendEmail(EmailInfo emailInfo) {

        MimeMessagePreparator preparator = new MimeMessagePreparator() {

            public void prepare(MimeMessage mimeMessage) throws Exception {

                MimeMessageHelper message = new MimeMessageHelper(mimeMessage,
                        true);
                message.setTo(emailInfo.getToEmailAddress().split(","));
                message.setFrom(new InternetAddress(emailInfo.getFromEmailAddress()));
                message.setSubject(emailInfo.getSubject());
                message.setText(emailInfo.getMessage(), true);
                if(null != emailInfo.getCc() && emailInfo.getCc().length >1)
                {
                    message.setCc(emailInfo.getCc());
                }
                if (emailInfo.getAttachmentPath() != null) {
                    FileSystemResource file = new FileSystemResource(
                            emailInfo.getAttachmentPath());
                    message.addAttachment(emailInfo.getAttachmentName(), file);
                }
            }
        };
        this.javaMailSender.send(preparator);
    }
}

例外

org.springframework.mail.MailSendException: Failed messages: javax.mail.MessagingException: Exception reading response;
  nested exception is:
    java.net.SocketTimeoutException: Read timed out

请告知如何使用多线程而不出现任何错误。