使用Java Mail发送邮件时出错

Question

我在使用Java Mail发送邮件时遇到以下错误。下面是错误。你能告诉我错误的原因吗？

ERROR :: Sending failed;
  nested exception is:
    class javax.mail.SendFailedException: Invalid Addresses;
  nested exception is:
    class javax.mail.SendFailedException: 452 Too many recipients received this hour
;
  nested exception is:
    class javax.mail.SendFailedException: 452 Too many recipients received this hour
;
  nested exception is:
    class javax.mail.SendFailedException: 452 Too many recipients received this hour
;
  nested exception is:
    class javax.mail.SendFailedException: 452 Too many recipients received this hour
;
  nested exception is:
    class javax.mail.SendFailedException: 452 Too many recipients received this hour
;
  nested exception is:
    class javax.mail.SendFailedException: 452 Too many recipients received this hour
;
  nested exception is:
    class javax.mail.SendFailedException: 452 Too many recipients received this hour

下面是导致异常的方法。

公共空sendTextReport(DataBean dataBean，TextBean textBean)抛出IOException，MessagingException {

    Session session = getAuthentication();


        MimeMessage message = new MimeMessage(session);
        message.setFrom(new InternetAddress(this.props.getProperty("from")));
        message.addRecipients(Message.RecipientType.TO,InternetAddress.parse(this.props.getProperty("textTo")));
        message.addRecipients(Message.RecipientType.CC,InternetAddress.parse(this.props.getProperty("textCc")));

        message.setSubject(" Report for the submissions between "+ dates.getDate1() + " and " + dates.getDate2());

        StringBuilder mailBody = new StringBuilder();

        mailBody.append("<text>Hi All,<br><br>Below is the Report for the submissions </text><br><br><br>");
        mailBody.append("<table><tr><th>Description</th><th>Count</th></tr>");

        LinkedHashMap map=(LinkedHashMap) getTextMap(dataBean,textBean);
        Iterator it=map.entrySet().iterator();
        while(it.hasNext()){
            Entry<String, Integer> entry=(Entry) it.next();
            mailBody.append("<tr><td>"+entry.getKey()+"</th><td class='count'>"+entry.getValue()+"</td></tr>");
        } 


        BodyPart messageBodyPart1 = new MimeBodyPart();

        messageBodyPart1.setContent(mailBody.toString(), "text/html");

        Multipart multipart = new MimeMultipart();
        multipart.addBodyPart(messageBodyPart1);

        message.setContent(multipart);

        Transport.send(message);

}

public Session getAuthentication() {

    final String host = this.props.getProperty("from");
    final String password = this.props.getProperty("password");
    properties.setProperty("mail.smtp.host", this.props.getProperty("hostName"));
    Session session = Session.getInstance(properties,null);
    return session;

}

textTo:该字符串包含3个电子邮件地址textCc:该字符串包含1个通讯组列表，该列表包含8个电子邮件地址。

所有这些都是有效的电子邮件地址。我检查了SendFailedException.Seems中的getValidUnsentAddresses()，所有这些都是有效的，但没有发送出去。

Answer 1

这就是所谓的灰色列表。当您发送太多电子邮件(或者更常见的情况是，在收件人不存在的情况下，发送了一定数量的电子邮件)，目标邮件服务器不会将您列入黑名单，而是会暂时阻止从您的邮件服务器(本质上是您的邮件服务器的IP地址)进行访问。通常此块设置为1小时，但显然可以根据配置的不同而有所不同。

您可以做以下几件事：

1.联系相关域名的管理员(例如postmaster@messaging.sprintpcs.com)，请求将您的IP地址列入白名单。(他们可以拒绝)。

2.检查/增加电子邮件在本地队列中的停留时间(以获得更多重试并最终送达的机会。

3.向您的服务器添加更多公有IP地址