从 java 应用程序发送电子邮件时出现异常：中继被拒绝答案

【问题标题】：Exception in sending emails from java application : Relaying denied从 java 应用程序发送电子邮件时出现异常：中继被拒绝
【发布时间】：2014-03-19 23:57:30
【问题描述】：

我们正在使用 Spring Mail 从 java 应用程序发送电子邮件 org.springframework.mail.javamail.JavaMailSenderImpl

Spring 电子邮件配置是

<bean id="mailSender" class="org.springframework.mail.javamail.JavaMailSenderImpl" autowire-candidate="default">
        <property name="host" value="${test.email.host}" />
        <property name="port" value="${test.email.port}" />
        <property name="username" value="${test.email.username}" />
        <property name="password" value="${test.email.password}" />
        <property name="javaMailProperties">
            <props>
                <prop key="mail.smtp.auth">true</prop>

            </props>
        </property>
    </bean>

Java 代码快照是

    @Autowired(required = true)
    @Qualifier("errorMessageMailSender")
    JavaMailSenderImpl mailSender;

    ..............
    ..............

          try {
                MimeMessage mailMessage = buildEmailMimeMessage(properties,mimeMultipart);
                logger.info(String.format("Built MimeMessage object is <%s>",mailMessage));
                if (mailMessage != null) {
                    mailSender.send(mailMessage);
                    logger.info("Mail sent Successfully");
                }else{
                    logger.info("Mail send failed as Mail message object construction failed.");
                }
                result=true;
            } catch (Exception e) {
                logger.error("An exception occurred while sending mail :: " + e.getMessage());
            }

属性文件

test.email.host=mail.mydomain.net
test.email.port=2525
test.email.username=demo@mydomain.net
test.email.password=mypassword

但我们处于例外状态，并且没有发送电子邮件

An exception occurred while sending mail :: Failed messages: javax.mail.SendFailedException: Invalid Addresses;
  nested exception is:
    com.sun.mail.smtp.SMTPAddressFailedException: 550 5.7.1 <demo@mydomain.net>... Relaying denied

【问题讨论】：

查看gammadyne.com/relaying_denied.htm，google的第一个结果
这是一个 SMTP 问题，不是 Java 问题...
如果我将用户名和密码属性保留为空白，smtp auth 属性是否设置为 true，会导致此问题吗？

标签： java spring smtp jakarta-mail emailrelay

【解决方案1】：

您尝试发送邮件的 smtp 服务器拒绝中继。如果您自己的本地服务器没有问题，您可以更改配置以中继来自 mydomain.net 的邮件。但如果是外部服务器（例如gmail），则必须使用真实的注册域。

要针对邮件服务器测试您的代码，我建议您设置一个 dockerized Apache James 服务器，在其上创建一些测试用户并发送和接收电子邮件。

【讨论】：

【解决方案2】：

此 JavaMail 常见问题解答条目应该会有所帮助：

When I try to send a message, why do I get javax.mail.SendFailedException: 550 Unable to relay for my-address?

【讨论】：

【解决方案3】：

工作代码，

import java.util.Properties;

import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

public class JavaEmail {

    Properties emailProperties;
    Session mailSession;
    MimeMessage emailMessage;

    public static void main(String args[]) throws AddressException,
            MessagingException {

        JavaEmail javaEmail = new JavaEmail();

        javaEmail.setMailServerProperties();
        javaEmail.createEmailMessage();
        javaEmail.sendEmail();
    }

    public void setMailServerProperties() {

        String emailPort = "587";//gmail's port

        emailProperties = System.getProperties();
        emailProperties.put("mail.smtp.port", emailPort);
        emailProperties.put("mail.smtp.auth", "true");
        emailProperties.put("mail.smtp.starttls.enable", "true");

    }

    public void createEmailMessage() throws AddressException,
            MessagingException {
        String[] toEmails = { "enter to mail ids" };
        String emailSubject = "Java Email";
        String emailBody = "This is an email sent by JavaMail api.";

        mailSession = Session.getDefaultInstance(emailProperties, null);
        emailMessage = new MimeMessage(mailSession);

        for (int i = 0; i < toEmails.length; i++) {
            emailMessage.addRecipient(Message.RecipientType.TO, new InternetAddress(toEmails[i]));
        }

        emailMessage.setSubject(emailSubject);
        emailMessage.setContent(emailBody, "text/html");//for a html email
        //emailMessage.setText(emailBody);// for a text email

    }

    public void sendEmail() throws AddressException, MessagingException {

        String emailHost = "smtp.gmail.com";
        String fromUser = "enter from Id";//ignore gmail domain
        String fromUserEmailPassword = "enter password";

        Transport transport = mailSession.getTransport("smtp");

        transport.connect(emailHost, fromUser, fromUserEmailPassword);
        transport.sendMessage(emailMessage, emailMessage.getAllRecipients());
        transport.close();

    }

}

【讨论】：

【解决方案4】：

据我所知，您的电子邮件服务必须在您的生产范围内。您不能从该领域之外访问 prod smtp 服务器。至少我遇到的问题是这样的。

【讨论】：