发送邮件没有图片和附件

### 版本情况 JDK版本： openjdk_25 hutool版本： 7.0.0-M7（请确保最新尝试是否还有问题） ### 问题描述（包括截图） 1. 复现代码 ```java package com.kirno7.test.other; import cn.hutool.v7.core.io.file.FileUtil; import cn.hutool.v7.extra.mail.MailAccount; import cn.hutool.v7.extra.mail.MailUtil; import com.kirno7.base.context.util.Kirno7LogUtil; import org.junit.jupiter.api.Disabled; import org.junit.jupiter.api.Test; import java.io.File; import java.io.InputStream; import java.util.HashMap; import java.util.List; import java.util.Map; public class MailUtilTest { @Test @Disabled void test() { MailAccount mailAccount = new MailAccount().setFrom("XXXXXXX@qq.com").setAuth(true) .setUser("XXXXXXX@qq.com").setPass("xxxxxxxxxx".toCharArray()) .setHost("smtp.qq.com").setPort(465) .setSslEnable(true).setStarttlsEnable(true).setDebug(true); Map<String, InputStream> imageMap = new HashMap<>(); imageMap.put("abc", FileUtil.getInputStream("E:/WeiyunSync/9-pic/openai.jpeg")); imageMap.put("abcd", FileUtil.getInputStream("E:/WeiyunSync/9-pic/openai.png")); File file = new File("C:/Users/Administrator/Desktop/Temp/pdf_with_xss.pdf"); String messageId = MailUtil.send(mailAccount, List.of("xxxxxxxxxx@qq.com"), List.of("xxxxxxxxxx@qq.com"), List.of("xxxxxxxxxx@qq.com"), "我是来测试的标题", "<h1>邮件来自Hutool测试</h1><img src=\"cid:abc\"/><img src=\"cid:abcd\"/>", imageMap,true, file); Kirno7LogUtil.info("messageId:{}", messageId); } } ```  2. 堆栈信息 ``` DEBUG: Jakarta Mail version 2.1.5 DEBUG: URL jar:file:/D:/maven/repository/org/eclipse/angus/angus-mail/2.0.5/angus-mail-2.0.5.jar!/META-INF/jakarta.providers DEBUG: successfully loaded resource: jar:file:/D:/maven/repository/org/eclipse/angus/angus-mail/2.0.5/angus-mail-2.0.5.jar!/META-INF/jakarta.providers DEBUG: successfully loaded resource: /META-INF/jakarta.default.providers DEBUG…