diff --git a/.github/release-notes/v1.2.9.md b/.github/release-notes/v1.2.9.md
new file mode 100644
index 0000000..bde100a
--- /dev/null
+++ b/.github/release-notes/v1.2.9.md
@@ -0,0 +1,25 @@
+## 本次更新
+
+### 修复邮件导入 413
+
+- 修复 all-in-one 和多容器部署中，内部 Nginx 使用默认 `1 MB` 上传限制，导致单封稍大的 EML 邮件也导入失败的问题。
+- API 上传入口现在允许最多 `50 MB` 的单批请求；单封邮件仍遵循系统设置中的邮件大小限制。
+- 遇到 `413 Request Entity Too Large` 时改为显示明确的中文提示。
+
+### 支持大批量导入
+
+- 一次选择多封 EML/MBOX 后，网页会按最多 20 个文件、约 `32 MB` 自动分批上传，无需用户手动拆分文件。
+- 每批成功后立即保存邮件；后续批次失败不会删除已经成功导入的邮件。
+- 导入结束后统一显示成功和跳过数量，并刷新当前邮件列表。
+
+### 保留历史邮件时间
+
+- 导入时继续保留邮件头中的原始 `Date` 时间。
+- 收件箱按邮件历史时间倒序显示，最新邮件排列在最前。
+- 新增回归测试，验证批量导入后不受文件选择或处理顺序影响。
+
+### 验证
+
+- 已通过 Go API 全量测试、前端 TypeScript 检查、生产构建和 shadcn/ui 检查。
+
+**完整更新日志**：[v1.2.8...v1.2.9](https://github.com/zxyszx/NewSzxcn-Email/compare/v1.2.8...v1.2.9)
diff --git a/VERSION b/VERSION
index db6fb4a..9d4f823 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.2.8
+1.2.9
diff --git a/apps/api/internal/app/mail_transfer_handlers_test.go b/apps/api/internal/app/mail_transfer_handlers_test.go
index 867c568..6d915eb 100644
--- a/apps/api/internal/app/mail_transfer_handlers_test.go
+++ b/apps/api/internal/app/mail_transfer_handlers_test.go
@@ -65,20 +65,21 @@ func TestMailImportExportAndOwnership(t *testing.T) {
 		t.Fatalf("owner login=%d", code)
 	}
 
-	eml := []byte("From: sender@example.com\r\nTo: " + ownerMailbox.Address + "\r\nSubject: imported message\r\nMessage-ID: <imported@example.com>\r\nContent-Type: text/plain; charset=utf-8\r\n\r\nhello import")
+	eml := []byte("From: sender@example.com\r\nTo: " + ownerMailbox.Address + "\r\nSubject: imported message\r\nDate: Tue, 2 Jan 2024 12:00:00 +0000\r\nMessage-ID: <imported@example.com>\r\nContent-Type: text/plain; charset=utf-8\r\n\r\nhello import")
+	olderEML := []byte("From: sender@example.com\r\nTo: " + ownerMailbox.Address + "\r\nSubject: older imported message\r\nDate: Mon, 1 Jan 2024 12:00:00 +0000\r\nMessage-ID: <older-imported@example.com>\r\nContent-Type: text/plain; charset=utf-8\r\n\r\nolder import")
 	var imported struct {
 		Imported int      `json:"imported"`
 		Skipped  int      `json:"skipped"`
 		Errors   []string `json:"errors"`
 	}
-	if code := doMailImport(t, owner, ownerMailbox.ID, "Inbox", map[string][]byte{"message.eml": eml}, &imported); code != http.StatusOK || imported.Imported != 1 || imported.Skipped != 0 {
+	if code := doMailImport(t, owner, ownerMailbox.ID, "Inbox", map[string][]byte{"message.eml": eml, "older.eml": olderEML}, &imported); code != http.StatusOK || imported.Imported != 2 || imported.Skipped != 0 {
 		t.Fatalf("import code=%d response=%+v", code, imported)
 	}
 
 	var list struct {
 		Items []MailMessage `json:"items"`
 	}
-	if code := owner.do("GET", "/api/mail/messages?folder=Inbox&mailboxId="+ownerMailbox.ID, nil, &list); code != http.StatusOK || len(list.Items) != 1 || list.Items[0].Subject != "imported message" {
+	if code := owner.do("GET", "/api/mail/messages?folder=Inbox&mailboxId="+ownerMailbox.ID, nil, &list); code != http.StatusOK || len(list.Items) != 2 || list.Items[0].Subject != "imported message" || list.Items[1].Subject != "older imported message" {
 		t.Fatalf("list code=%d items=%+v", code, list.Items)
 	}
 
@@ -90,7 +91,7 @@ func TestMailImportExportAndOwnership(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	if len(zr.File) != 1 {
+	if len(zr.File) != 2 {
 		t.Fatalf("zip entries=%d", len(zr.File))
 	}
 	entry, err := zr.File[0].Open()
diff --git a/apps/web/src/lib/api.ts b/apps/web/src/lib/api.ts
index 8d19b37..5fad19a 100644
--- a/apps/web/src/lib/api.ts
+++ b/apps/web/src/lib/api.ts
@@ -85,6 +85,7 @@ async function uploadForm<T>(path: string, form: FormData): Promise<T> {
   try {
     const res = await fetch(path, { method: "POST", credentials: "include", body: form, signal: controller.signal })
     if (!res.ok) {
+      if (res.status === 413) throw new Error("导入文件过大，请减少单次导入数量后重试")
       let message = `${res.status} ${res.statusText}`
       try { const body = await res.json(); message = body.error || message } catch {}
       throw new Error(message)
diff --git a/apps/web/src/pages/mail.tsx b/apps/web/src/pages/mail.tsx
index 6ef87b8..bf1e5b9 100644
--- a/apps/web/src/pages/mail.tsx
+++ b/apps/web/src/pages/mail.tsx
@@ -88,9 +88,28 @@ const filterLabels: Record<MailFilter, string> = {
 
 const emptyAdvancedSearch: AdvancedMailSearch = { from: "", to: "", subject: "", startDate: "", endDate: "", hasAttachments: false, unread: false, starred: false }
 const emptyAdvancedSearchDraft: AdvancedMailSearchDraft = { ...emptyAdvancedSearch }
+const mailImportBatchBytes = 32 * 1024 * 1024
+const mailImportBatchFiles = 20
 const mailCompactBreakpoint = 768
 const mailDetailBreakpoint = 768
 
+function buildMailImportBatches(files: File[]) {
+  const batches: File[][] = []
+  let batch: File[] = []
+  let batchBytes = 0
+  for (const file of files) {
+    if (batch.length > 0 && (batch.length >= mailImportBatchFiles || batchBytes + file.size > mailImportBatchBytes)) {
+      batches.push(batch)
+      batch = []
+      batchBytes = 0
+    }
+    batch.push(file)
+    batchBytes += file.size
+  }
+  if (batch.length > 0) batches.push(batch)
+  return batches
+}
+
 function useMaxViewportWidth(maxWidth: number) {
   const [matches, setMatches] = React.useState(false)
   React.useEffect(() => {
@@ -1112,8 +1131,22 @@ export function MailPage() {
     if (files.length === 0 || !selectedMailbox) return
     setImportingMail(true)
     try {
-      const result = await api.importMail(files, { mailboxId: selectedMailbox.id, folder: mailView === "folder" ? folder : "Inbox" })
+      const batches = buildMailImportBatches(files)
+      const target = { mailboxId: selectedMailbox.id, folder: mailView === "folder" ? folder : "Inbox" }
+      const result = { imported: 0, skipped: 0, errors: [] as string[] }
+      for (const batch of batches) {
+        try {
+          const current = await api.importMail(batch, target)
+          result.imported += current.imported
+          result.skipped += current.skipped
+          result.errors.push(...current.errors)
+        } catch (error) {
+          result.skipped += batch.length
+          result.errors.push(error instanceof Error ? error.message : "导入请求失败")
+        }
+      }
       await refreshMailData()
+      if (result.imported === 0 && result.errors.length > 0) throw new Error(result.errors[0])
       toast({
         title: `已导入 ${result.imported} 封邮件`,
         description: result.skipped > 0 ? `${result.skipped} 封未能导入${result.errors[0] ? `：${result.errors[0]}` : ""}` : `已保存到 ${mailView === "folder" ? viewTitle : "收件箱"}`,
diff --git a/deploy/all-in-one/nginx.conf b/deploy/all-in-one/nginx.conf
index a114fa5..ead8329 100644
--- a/deploy/all-in-one/nginx.conf
+++ b/deploy/all-in-one/nginx.conf
@@ -5,6 +5,7 @@ server {
   index index.html;
 
   location /api/ {
+    client_max_body_size 50m;
     proxy_pass http://127.0.0.1:8080/api/;
     proxy_http_version 1.1;
     proxy_set_header Host $host;
diff --git a/deploy/nginx/default.conf b/deploy/nginx/default.conf
index 726a3ba..50fb8b2 100644
--- a/deploy/nginx/default.conf
+++ b/deploy/nginx/default.conf
@@ -3,6 +3,7 @@ server {
   server_name _;
 
   location /api/ {
+    client_max_body_size 50m;
     proxy_pass http://api:8080/api/;
     proxy_http_version 1.1;
     proxy_set_header Host $host;