添加一个MailMessage类，用于构造邮件参数

sms4j-Email-plugin/sms4j-Email-api/src/main/java/org/dromara/email/api/MailClient.java

@@ -81,6 +81,8 @@ public interface MailClient {
      * @param title 邮件标题
      * @param body 邮件正文
      * @param files 附件，可添加多个
+     * @param bcc 密送人
+     * @param cc 抄送人
      * @author :Wind
     */
     void sendEmail(List<String> mailAddress, String title, String body,List<String> cc,List<String> bcc,Map<String,String> files);

sms4j-Email-plugin/sms4j-Email-core/src/main/java/org/dromara/email/core/entity/MailMessage.java

@@ -0,0 +1,105 @@
+package org.dromara.email.core.entity;
+
+import lombok.Getter;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+@Getter
+public class MailMessage {
+
+    /** 收件人地址*/
+    private List<String> mailAddress;
+
+    /** 邮件主题*/
+    private String title;
+
+    /** 文字正文*/
+    private String body;
+
+    /** 抄送人*/
+    private List<String> cc;
+
+    /** 密送人*/
+    private List<String> bcc;
+
+    /** 附件*/
+    private Map<String,String> files;
+
+    public static MailsBuilder Builder(){
+        return new MailsBuilder();
+    }
+
+    static class MailsBuilder{
+        private final MailMessage mailMessage = new MailMessage();
+        public MailsBuilder() {
+        }
+        public MailMessage build(){
+            return mailMessage;
+        }
+
+        public MailsBuilder setMailAddress(List<String> mailAddress) {
+            mailMessage.mailAddress = mailAddress;
+            return this;
+        }
+
+        public MailsBuilder setMailAddress(String mailAddress){
+            if ( mailMessage.mailAddress == null){
+                mailMessage.mailAddress = new ArrayList<>();
+            }
+            mailMessage.mailAddress.add(mailAddress);
+            return this;
+        }
+
+        public MailsBuilder setTitle(String title){
+            mailMessage.title = title;
+            return this;
+        }
+
+        public MailsBuilder setBody(String body){
+            mailMessage.body = body;
+            return this;
+        }
+
+        public MailsBuilder setCc(List<String> cc){
+            mailMessage.cc = cc;
+            return this;
+        }
+
+        public MailsBuilder setCc(String cc){
+            if (mailMessage.cc == null){
+                mailMessage.cc = new ArrayList<>();
+            }
+            mailMessage.cc.add(cc);
+            return this;
+        }
+
+        public MailsBuilder setBcc(List<String> bcc){
+            mailMessage.bcc = bcc;
+            return this;
+        }
+
+        public MailsBuilder setBcc(String bcc){
+            if (mailMessage.bcc == null){
+                mailMessage.bcc = new ArrayList<>();
+            }
+            mailMessage.bcc.add(bcc);
+            return this;
+        }
+
+        public MailsBuilder setFiles(Map<String, String> files){
+            mailMessage.files = files;
+            return this;
+        }
+
+        public MailsBuilder setFiles(String fileName,String filePath){
+            if (mailMessage.files == null){
+                mailMessage.files = new HashMap<>();
+            }
+            mailMessage.files.put(fileName,filePath);
+            return this;
+        }
+    }
+}