java 发送邮件时处理不可达的收件人

报错信息：

javax.mail.SendFailedException: Invalid Addresses;
  nested exception is:
   com.sun.mail.smtp.SMTPAddressFailedException: 550 5.7.1 Unable to relay for aerchi@gmail.com

 

两种改法：

  第一种：排查收件人地址是否正确（我还是推荐这种改法，避免了负责人收不到邮件）

  第二种：获取有效收件人（对于收件人没法指定要求这个还是不错的，保障部分负责人能收到邮件）

getInvalidAddresses（ ）获取无效且因此未发送到的地址数组
getValidSentAddresses（）获取成功发送此消息的地址数组
getValidUnsentAddresses（）获取一个地址数组有效但邮件未发送到该邮件

方法：

try{
        Transport.send(msg);
        //Transport.sendMessage(msg);
        Out.println("the mail send successful First. "+Out.getNowDate());
     }catch(UnsupportedEncodingException e) { 
        e.printStackTrace();
     }catch(SendFailedException  se) {    
        se.printStackTrace();
        //  Exception ex = me;
        //if (ex instanceof SendFailedException) {}  
                         
         Address[] unsend = se.getValidUnsentAddresses(); 
         if(null!=unsend){  
            //Out.println(" ==valid Addresses");
            String validAddress = "";
            for(int i=0;i<unsend.length;i++){
                validAddress += unsend[i] + ";";
                //Out.println((i+1)+": " + unsend[i]);
            }
         validAddress = validAddress.substring(0,validAddress.length()-1);
         //Out.println("All: "+validAddress);
         //send the mail when mail address wrong.
         sendFailMail(new MimeMessage(mailSession), mailBody, mailFrom, validAddress);
      }  
                 
      }catch(MessagingException me) {
          me.printStackTrace();
      }
     
        
    /**
     * email: aerchi@gmail.com
     * site: www.aerchi.com
     * blog: http://blog.csdn.net/aerchi    
     */
    //send the mail when mail address wrong.
    public static void sendFailMail(Message msg, BodyPart mailBody, Address mailFrom, String mailTOAddress ){
        try{   
            Out.println("...Send the mail second time.");
            msg.setSentDate(new Date());
            
            msg.setFrom(mailFrom);          
            
            String[] mailTOArray=null;      
            mailTOArray=mailTOAddress.split(";");
            
            InternetAddress[] mailTOAdd = null;
            mailTOAdd = new InternetAddress[mailTOArray.length];
            for(int a=0;a<mailTOArray.length;a++)   
            {
                //Out.println(mailTOArray[a]);
                mailTOAdd[a]= new InternetAddress(mailTOArray[a]);              
            }   
            
            msg.setRecipients(Message.RecipientType.TO, mailTOAdd);         
            
            msg.setSubject(mailSubject);                        
     
            Multipart mailMulti = new MimeMultipart();  
           //mailBody.setContent(mainText, "text/html;charset=utf-8");                   
            mailMulti.addBodyPart(mailBody);            
            msg.setContent(mailMulti);          
        
            Transport.send(msg);    
            Out.println("...the mail send successful Second. "+Out.getNowDate());
        }catch(MessagingException me) {
            me.printStackTrace();
        }       
    }

学习来源：https://blog.csdn.net/aerchi/article/details/41692913

                 https://www.cnblogs.com/yejg1212/archive/2013/06/01/3112702.html

                 https://www.it1352.com/992663.html

                 https://blog.csdn.net/xiaomage1314/article/details/72957119