simple java mail

 <dependency>
     <groupId>org.simplejavamail</groupId>
     <artifactId>simple-java-mail</artifactId>
     <version>5.1.3</version>
 </dependency>

 /**
  *文件类型参考http://www.w3school.com.cn/media/media_mimeref.asp mime手册
  *@author Tele
  *
  */
 public class Demo {
     @Test
     public void test() throws FileNotFoundException, IOException {
 
         ByteArrayDataSource img1 = new ByteArrayDataSource(new FileInputStream("./src/main/resources/a.jpg"),"image/png");
 
         ByteArrayDataSource img2 = new ByteArrayDataSource(new FileInputStream("./src/main/resources/b.jpg"),"image/png");
 
         //发送多张图片
         AttachmentResource attachmentResource1 = new AttachmentResource("image1.jpg",img1);
         AttachmentResource attachmentResource2 = new AttachmentResource("image2.jpg",img2);
 
         List<AttachmentResource> list = new ArrayList<>();
         list.add(attachmentResource1);
         list.add(attachmentResource2);
 
         //发送附件
         ByteArrayDataSource zip = new ByteArrayDataSource(new FileInputStream("C:\\Users\\Administrator\\Desktop\\image.zip"),"application/zip");
 
         Email email = EmailBuilder.startingBlank()
                   .from("tele","账号")
                   .to("二狗", "账号")
                   .withSubject("hey,春游么,今天又是阳光明媚的一天啊")
                   .withPlainText("发送图片测试")
                   .withHeader("X-Priority", 5)
                   .withEmbeddedImage("xx.jpg",img1)
                   .withEmbeddedImages(list)
               //    .withAttachment("image.zip", zip)
                   .withReturnReceiptTo()
                   .buildEmail();
 
         Mailer mailer = MailerBuilder
                 //smtp授权码
                   .withSMTPServer("smtp.163.com", 25, "账号", "smtp授权码")
                   .withSessionTimeout(10 * 1000)
            //       .clearEmailAddressCriteria() // turns off email validation
                   .withProperty("mail.smtp.sendpartial", "true")
            //       .withDebugLogging(true)
                   .buildMailer();
 
         mailer.sendMail(email);
     }
 
     @Test
     public void test2() throws InterruptedException, FileNotFoundException, IOException {
         for(int i=0;i<10;i++) {
             test();
             Thread.sleep(2000);
         }
 
     }
 
 }

标题和内容尽量用正常的内容,否则会被标识为垃圾邮件,被系统退回,附件越大,发送的时间越长