diff --git a/mail-vue/src/views/sys-setting/index.vue b/mail-vue/src/views/sys-setting/index.vue
index 5457f3f..de91e27 100644
--- a/mail-vue/src/views/sys-setting/index.vue
+++ b/mail-vue/src/views/sys-setting/index.vue
@@ -187,7 +187,7 @@
           <div class="settings-card">
             <div class="card-title">{{ $t('oss') }}</div>
             <div class="card-content">
-              <div class="setting-item">
+              <div class="r2domain-item">
                 <div><span>{{ $t('osDomain') }}</span></div>
                 <div class="r2domain">
                   <span>{{ setting.r2Domain || '' }}</span>
@@ -199,9 +199,7 @@
               <div class="setting-item">
                 <div><span>{{ $t('s3Configuration') }}</span></div>
                 <div class="r2domain">
-                  <el-button @mouseenter="s3IsDisabled = true"
-                             @mouseleave="s3IsDisabled = false"
-                             :disabled="setting.hasR2 && s3IsDisabled" class="opt-button" size="small" type="primary" @click="addS3Show = true">
+                  <el-button class="opt-button" size="small" type="primary" @click="addS3Show = true">
                     <Icon icon="fluent:settings-48-regular" width="16" height="16"/>
                   </el-button>
                 </div>
@@ -699,7 +697,6 @@ const r2DomainInput = ref('')
 const loginOpacity = ref(0)
 const backgroundUrl = ref('')
 let backgroundFile = {}
-const s3IsDisabled = ref(false)
 const showSetBackground = ref(false)
 let regVerifyCount = ref(1)
 let addVerifyCount = ref(1)
@@ -1348,6 +1345,21 @@ function editSetting(settingForm, refreshStatus = true) {
   }
 }
 
+.r2domain-item {
+  display: flex;
+  gap: 10px;
+  > div:first-child {
+    display: flex;
+    align-items: center;
+    gap: 5px;
+  }
+
+  > div:last-child {
+    flex: 1;
+    text-align: right;
+  }
+}
+
 .title-icon.warning {
   position: relative;
   top: 2px;
diff --git a/mail-worker/src/service/s3-service.js b/mail-worker/src/service/s3-service.js
index d7bdd59..93d502f 100644
--- a/mail-worker/src/service/s3-service.js
+++ b/mail-worker/src/service/s3-service.js
@@ -28,34 +28,57 @@ const s3Service = {
 		await client.send(new PutObjectCommand(obj))
 	},
 
-	async deleteObj(c,keys) {
+	async deleteObj(c, keys) {
 
 		if (typeof keys === 'string') {
-			keys = [keys]
+			keys = [keys];
 		}
 
 		if (keys.length === 0) {
-			return
+			return;
 		}
 
-		const client = await this.client(c)
-
+		const client = await this.client(c);
 		const { bucket } = await settingService.query(c);
 
+
+		client.middlewareStack.add(
+			(next) => async (args) => {
+
+				const body = args.request.body
+
+				// 计算 MD5 校验和并转换为 Base64 编码
+				const encoder = new TextEncoder();
+				const data = encoder.encode(body);
+
+				// 使用 Web Crypto API 计算 MD5 校验和
+				const hashBuffer = await crypto.subtle.digest('MD5', data);
+				const hashArray = new Uint8Array(hashBuffer);
+				const contentMD5 = btoa(String.fromCharCode.apply(null, hashArray));
+
+				args.request.headers["Content-MD5"] = contentMD5;
+
+				return next(args);
+			},
+			{ step: "build", name: "inspectRequestMiddleware" }
+		);
+
+
 		await client.send(
 			new DeleteObjectsCommand({
 				Bucket: bucket,
 				Delete: {
-					Objects: keys.map(key => ({Key: key}))
+					Objects: keys.map(key => ({ Key: key }))
 				}
 			})
-		)
+		);
 	},
 
+
 	async client(c) {
 		const { region, endpoint, s3AccessKey, s3SecretKey } = await settingService.query(c);
 		return new S3Client({
-			region: region,
+			region: region || 'auto',
 			endpoint: domainUtils.toOssDomain(endpoint),
 			credentials: {
 				accessKeyId: s3AccessKey,