Merge pull request #2681 from dataease/pr@dev@fix_email_file_name_too_long

fix(系统管理): 定时报告发送邮件附件名称过长导致展示错误

backend/src/main/java/io/dataease/service/system/EmailService.java

@@ -140,6 +140,7 @@ public class EmailService {
             attach.setFileName(MimeUtility.encodeText(file.getName()));
             multipart.addBodyPart(attach);
         }
+        System.getProperties().setProperty("mail.mime.splitlongparameters", "false");
         multipart.setSubType("related");
         return multipart;
     }