【转载】SpringBoot-配置发送邮件遇到的一些问题

前言：前一天调用163邮箱发送邮件还么有问题，今天再调用就各种发送不成功，害的我都关闭授权，还花了一毛钱短信费重新开启授权，最后百度到了一篇文章，非常贴切，在此转载下。

本人遇到的错误代码是554，邮件主题和内容有敏感词汇（您的验证码是），或者被当作垃圾邮件，修改了一下主题和内容就OK了。

使用springboot向163邮箱发送邮件遇到一些问题，主要归为如下几点：

1.连接smtp.163.com异常，报错：java.net.UnknownHostException: smtp.163.com
2.用户权限不足，报错：javax.mail.AuthenticationFailedException: 550 User has no permission
3.认证错误，报错：javax.mail.AuthenticationFailedException: 535 Error: authentication failed
4.发送内容错误，报错：com.sun.mail.smtp.SMTPSendFailedException: 554 DT:SPM
5.发送附件错误，报错：javax.mail.MessagingException: Empty multipart: multipart/related; 
6.发送静态图片资源，查看邮件，图片显示不出来

问题1：

详细报错如下：

org.springframework.mail.MailSendException: Mail server connection failed; nested exception is 

com.sun.mail.util.MailConnectException: Couldn't connect to host, port: smtp.163.com , 25; timeout
-1;
  nested exception is:
    java.net.UnknownHostException: smtp.163.com . Failed messages:
com.sun.mail.util.MailConnectException: Couldn't connect to host, port: smtp.163.com , 25; timeout 

-1;
  nested exception is:
    java.net.UnknownHostException: smtp.163.com ; message exception details (1) are:
Failed message 1:
com.sun.mail.util.MailConnectException: Couldn't connect to host, port: smtp.163.com , 25; timeout 

-1;
  nested exception is:
    java.net.UnknownHostException: smtp.163.com
    at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:2118)
    at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:712)
    at javax.mail.Service.connect(Service.java:366)
    at org.springframework.mail.javamail.JavaMailSenderImpl.connectTransport

(JavaMailSenderImpl.java:501)
    at org.springframework.mail.javamail.JavaMailSenderImpl.doSend(JavaMailSenderImpl.java:421)
    at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:345)
    at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:340)
    at mail.service.MailSendService.sendInlineMail(MailSendService.java:111)

解决思路：
1.进行telnet检查，查看telent smtp.163.com 25，发现可以正常telent成功，说明网络没问题
2.查看配置是否正常，经查看，发现springboot的application.properties文件中spring.mail.host=smtp.163.com后面有空格，去掉空格即可

问题2：

详细报错如下：

org.springframework.mail.MailAuthenticationException: Authentication failed; nested exception is

javax.mail.AuthenticationFailedException: 550 User has no permission

　　at org.springframework.mail.javamail.JavaMailSenderImpl.doSend(JavaMailSenderImpl.java:424)
　　at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:345)
　　at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:340)
　　at mail.service.MailSendService.sendInlineMail(MailSendService.java:111)
　　at mail.test.TestMail.test(TestMail.java:43)
　　at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
　　at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
　　at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
　　at java.lang.reflect.Method.invoke(Unknown Source)
　　at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
　　at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
　　at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
　　at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)

解决思路：
1.在cn.bing.com上搜索，发现有该问题的先例，问题原因是没有开启163邮箱的pop3/smtp协议
  参考文档：http://www.cnblogs.com/cosyer/p/6676023.html
2.登录163邮箱->设置->POP3/SMTP/IMAP设置->开启协议，正确设置授权码

问题3：

详细报错如下：

javax.mail.AuthenticationFailedException: 535 Error: authentication failed

    at org.springframework.mail.javamail.JavaMailSenderImpl.doSend(JavaMailSenderImpl.java:424)
    at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:345)
    at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:340)
    at mail.service.MailSendService.sendInlineMail(MailSendService.java:111)
    at mail.test.TestMail.test(TestMail.java:43)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)

解决思路：
1.163邮箱开通smtp服务后，javaMail发送邮箱要使用授权码作为登录密码
2.设置spring.mail.password=授权码

问题4：

详细报错如下：

org.springframework.mail.MailSendException: Failed messages: 

com.sun.mail.smtp.SMTPSendFailedException: 554 DT:SPM 163 smtp11,D8CowACX7CmSHB5b3SrlCA--.26635S3 

1528700051,please see http://mail.163.com/help/help_spam_16.htm?

ip=182.138.102.204&hostid=smtp11&time=1528700051
    at org.springframework.mail.javamail.JavaMailSenderImpl.doSend(JavaMailSenderImpl.java:474) 

~[spring-context-support-4.3.13.RELEASE.jar:4.3.13.RELEASE]
    at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:307) 

~[spring-context-support-4.3.13.RELEASE.jar:4.3.13.RELEASE]
    at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:296) 

~[spring-context-support-4.3.13.RELEASE.jar:4.3.13.RELEASE]
    at mail.service.MailSendService.sendSimpleMail(MailSendService.java:50) ~[classes/:na]
    at mail.test.TestMail.test(TestMail.java:36) [classes/:na]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.7.0_80]
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[na:1.7.0_80]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.7.0_80]
    at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.7.0_80]
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50) 

[junit-4.12.jar:4.12]
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) 

[junit-4.12.jar:4.12]
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47) 

[junit-4.12.jar:4.12]
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17) 

解决思路：
1.根据错误提示，查看如下url：
http://mail.163.com/help/help_spam_16.htmip=182.138.102.204&hostid=smtp11&time=1528700051
 这是163邮箱提供的一个错误码对应表
2.554 DT:SPM对应错误为：
 发送的邮件内容包含了未被许可的信息，或被系统识别为垃圾邮件。请检查是否有用户发送病毒或者垃圾邮件
3.修改邮件的主题及内容，使用合法信息，例如不要使用:test、测试这些信息

问题5：

详细报错如下：

Caused by: javax.mail.MessagingException: Empty multipart: multipart/related;
    boundary="----=_Part_2_1115361411.1528698722005"
    at javax.mail.internet.MimeMultipart.writeTo(MimeMultipart.java:548)
    at com.sun.mail.handlers.multipart_mixed.writeTo(multipart_mixed.java:81)
    ... 45 more

... 45 more
解决思路：
1.在cn.bing.com上搜索，问题原因是没有设置邮件内容，导致报该错误，其实和发送附件没有任何关系
参考文章：https://stackoverflow.com/questions/32306928/sending-emails-with-attachments-empty-
multipart

问题6：
无报错信息

解决思路：

1.检查代码，具体代码如下：

public boolean sendInlineMail(String fromPos, String toPos, String subject, FileSystemResource file)
{
    MimeMessage msg = mailSender.createMimeMessage();
    try
    {
        //MimeMessageHelper构造器，如果要发送附件邮件，必须指定multipart参数为true
        MimeMessageHelper helper  = new MimeMessageHelper(msg, true);
        helper.setFrom(fromPos);
        helper.setTo(toPos);
        helper.setSubject(subject);
        helper.setText("<html><body>静态资源:<img src='cid:pic' /></body></html>", true);
        helper.addInline("pic", file);
        mailSender.send(msg);
    }
    catch (MessagingException e)
    {
        logger.error("发送附件邮件失败.", e);
        return false;
    }

    return true;
}

2.对代码进行了调整：将addInline方法要放在setText后面，进行测试发现正常了，可能原因是顺序如果不对，导致资源没有被正确引用。

原文链接：遵循 CC 4.0 BY-SA 版权协议，https://blog.csdn.net/ignorewho/article/details/80654201