diff --git a/src/api/message.ts b/src/api/message.ts
index 5f5a9f4..888ce79 100644
--- a/src/api/message.ts
+++ b/src/api/message.ts
@@ -18,6 +18,10 @@ export interface MessageRecord {
   incidentId?: number
   alertRecordId?: number
   nextRetryAt?: string
+  occurrenceCount?: number
+  firstOccurredAt?: string
+  lastOccurredAt?: string
+  lastDeliveryId?: number
 }
 export type MessageListType = MessageRecord[]
 
diff --git a/src/api/ops/noticeChannel.ts b/src/api/ops/noticeChannel.ts
index e302904..ea14293 100644
--- a/src/api/ops/noticeChannel.ts
+++ b/src/api/ops/noticeChannel.ts
@@ -32,7 +32,7 @@ export const createNoticeChannel = (data: {
   email_to?: string[]
   email_cc?: string[]
   email_bcc?: string[]
-  email_use_tls?: boolean
+  email_security_mode?: 'none' | 'starttls' | 'tls'
   sms_provider?: string
   sms_access_key_id?: string
   sms_access_key_secret?: string
@@ -40,6 +40,7 @@ export const createNoticeChannel = (data: {
   sms_template_code?: string
   sms_phones?: string[]
   in_app_targets?: string[]
+  in_app_aggregation_window?: number
 }) => {
   return request.post('/Alert/v1/channel/create', data)
 }
@@ -67,7 +68,7 @@ export const updateNoticeChannel = (data: {
   email_to?: string[]
   email_cc?: string[]
   email_bcc?: string[]
-  email_use_tls?: boolean
+  email_security_mode?: 'none' | 'starttls' | 'tls'
   sms_provider?: string
   sms_access_key_id?: string
   sms_access_key_secret?: string
@@ -75,6 +76,7 @@ export const updateNoticeChannel = (data: {
   sms_template_code?: string
   sms_phones?: string[]
   in_app_targets?: string[]
+  in_app_aggregation_window?: number
 }) => {
   return request.post('/Alert/v1/channel/update', data)
 }
diff --git a/src/components/message-box/list.vue b/src/components/message-box/list.vue
index e58a35b..42fe441 100644
--- a/src/components/message-box/list.vue
+++ b/src/components/message-box/list.vue
@@ -13,7 +13,8 @@
           <a-tag v-if="item.deliveryStatus" :color="getDeliveryColor(item.deliveryStatus)">
             {{ getDeliveryLabel(item.deliveryStatus) }}
           </a-tag>
-          <a-tag v-else-if="item.messageType === 0" color="gray">未开始</a-tag>
+          <a-tag v-if="(item.occurrenceCount || 1) > 1" color="arcoblue">发生 {{ item.occurrenceCount }} 次</a-tag>
+          <a-tag v-if="item.messageType === 0" color="gray">未开始</a-tag>
           <a-tag v-else-if="item.messageType === 1" color="green">已开通</a-tag>
           <a-tag v-else-if="item.messageType === 2" color="blue">进行中</a-tag>
           <a-tag v-else-if="item.messageType === 3" color="red">即将到期</a-tag>
diff --git a/src/views/ops/pages/alert/notice/components/ChannelFormDialog.vue b/src/views/ops/pages/alert/notice/components/ChannelFormDialog.vue
index 09b7408..bae3deb 100644
--- a/src/views/ops/pages/alert/notice/components/ChannelFormDialog.vue
+++ b/src/views/ops/pages/alert/notice/components/ChannelFormDialog.vue
@@ -58,8 +58,12 @@
         <a-form-item label="密送" field="email_bcc">
           <a-input-tag v-model="form.email_bcc" placeholder="输入密送邮箱后回车，可选" allow-clear />
         </a-form-item>
-        <a-form-item label="启用 TLS" field="email_use_tls">
-          <a-switch v-model="form.email_use_tls" />
+        <a-form-item label="连接安全方式" field="email_security_mode">
+          <a-select v-model="form.email_security_mode" placeholder="请选择连接安全方式" @change="handleEmailSecurityModeChange">
+            <a-option value="none">普通 SMTP</a-option>
+            <a-option value="starttls">STARTTLS</a-option>
+            <a-option value="tls">TLS</a-option>
+          </a-select>
         </a-form-item>
       </template>
 
@@ -98,20 +102,66 @@
 
       <template v-if="form.type === 'in_app'">
         <a-form-item label="站内消息目标" field="in_app_targets">
-          <a-input-tag v-model="form.in_app_targets" placeholder="输入目标后回车，如 user:42" allow-clear />
+          <a-select
+            v-model="form.in_app_targets"
+            placeholder="请选择接收用户"
+            multiple
+            allow-clear
+            allow-search
+            :filter-option="false"
+            :loading="userLoading"
+            @search="handleUserSearch"
+          >
+            <a-option v-for="user in userOptions" :key="user.id" :value="`user:${user.id}`">
+              {{ user.name || user.username || `用户 ${user.id}` }}（{{ user.username || user.id }}）
+            </a-option>
+          </a-select>
+        </a-form-item>
+        <a-form-item label="同告警聚合窗口（秒）" field="in_app_aggregation_window">
+          <a-input-number v-model="form.in_app_aggregation_window" :min="10" :max="3600" style="width: 100%" />
         </a-form-item>
       </template>
 
-      <a-form-item label="消息模板" field="message_template">
+      <a-form-item field="message_template">
+        <template #label>
+          <span class="template-label">
+            <span>消息模板</span>
+            <a-popover position="right" trigger="hover">
+              <icon-question-circle class="template-help-icon" />
+              <template #content>
+                <div class="template-help-panel">
+                  <div class="template-help-header">
+                    <strong>可用变量</strong>
+                    <span>变量区分大小写</span>
+                  </div>
+                  <table class="template-help-table">
+                    <thead>
+                      <tr>
+                        <th>变量</th>
+                        <th>说明</th>
+                      </tr>
+                    </thead>
+                    <tbody>
+                      <tr v-for="item in messageTemplateVariables" :key="item.variable">
+                        <td><code>{{ item.variable }}</code></td>
+                        <td>{{ item.description }}</td>
+                      </tr>
+                    </tbody>
+                  </table>
+                </div>
+              </template>
+            </a-popover>
+          </span>
+        </template>
         <a-textarea
           v-model="form.message_template"
-          placeholder="请输入消息模板，支持变量：{{.RuleName}}、{{.Summary}}、{{.FiredAt}}、{{.Value}}、{{.Threshold}}等"
+          placeholder="请输入消息模板"
           :auto-size="{ minRows: 3, maxRows: 6 }"
           :max-length="1000"
         />
       </a-form-item>
 
-      <a-row :gutter="16">
+      <a-row v-if="form.type !== 'in_app'" :gutter="16">
         <a-col :span="12">
           <a-form-item label="限流次数" field="rate_limit">
             <a-input-number v-model="form.rate_limit" placeholder="0表示不限制" :min="0" :max="10000" style="width: 100%" />
@@ -169,7 +219,7 @@
         </a-space>
       </a-form-item>
 
-      <a-row :gutter="16">
+      <a-row v-if="form.type !== 'in_app'" :gutter="16">
         <a-col :span="12">
           <a-form-item label="重试次数" field="retry_times">
             <a-input-number v-model="form.retry_times" placeholder="发送失败重试次数" :min="0" :max="10" style="width: 100%" />
@@ -199,8 +249,11 @@
 <script lang="ts" setup>
 import { ref, watch, computed, onMounted } from 'vue'
 import { Message } from '@arco-design/web-vue'
+import { IconQuestionCircle } from '@arco-design/web-vue/es/icon'
 import { createNoticeChannel, updateNoticeChannel } from '@/api/ops/noticeChannel'
 import { fetchAlertLevelOptions } from '@/api/ops/alertLevel'
+import { fetchUserList } from '@/api/ops/rbac2'
+import type { UserItem } from '@/api/ops/rbac2'
 
 interface NoticeChannel {
   id?: number
@@ -224,7 +277,7 @@ interface NoticeChannel {
   email_to?: string[] | string
   email_cc?: string[] | string
   email_bcc?: string[] | string
-  email_use_tls?: boolean
+  email_security_mode?: 'none' | 'starttls' | 'tls'
   sms_provider?: string
   sms_access_key_id?: string
   sms_access_key_secret?: string
@@ -232,6 +285,7 @@ interface NoticeChannel {
   sms_template_code?: string
   sms_phones?: string[] | string
   in_app_targets?: string[] | string
+  in_app_aggregation_window?: number
 }
 
 interface Props {
@@ -239,6 +293,21 @@ interface Props {
   channel: NoticeChannel | null
 }
 
+const messageTemplateVariables = [
+  { variable: '{{.AlertName}}', description: '告警名称' },
+  { variable: '{{.RuleName}}', description: '规则名称' },
+  { variable: '{{.Severity}}', description: '告警级别' },
+  { variable: '{{.Status}}', description: '告警状态' },
+  { variable: '{{.Summary}}', description: '告警摘要' },
+  { variable: '{{.Description}}', description: '详细描述' },
+  { variable: '{{.Value}}', description: '当前值' },
+  { variable: '{{.Threshold}}', description: '阈值' },
+  { variable: '{{.FiredAt}} / {{.StartsAt}}', description: '触发时间' },
+  { variable: '{{.ResolvedAt}}', description: '恢复时间' },
+  { variable: '{{.Duration}}', description: '持续秒数' },
+  { variable: '{{.Fingerprint}}', description: '告警指纹' },
+] as const
+
 interface Emits {
   (e: 'update:visible', value: boolean): void
   (e: 'success'): void
@@ -271,14 +340,14 @@ const form = ref({
   enabled: true,
   description: '',
   email_smtp_host: '',
-  email_smtp_port: 25,
+  email_smtp_port: 587,
   email_username: '',
   email_password: '',
   email_from: '',
   email_to: [] as string[],
   email_cc: [] as string[],
   email_bcc: [] as string[],
-  email_use_tls: false,
+  email_security_mode: 'starttls' as 'none' | 'starttls' | 'tls',
   sms_provider: '',
   sms_access_key_id: '',
   sms_access_key_secret: '',
@@ -286,6 +355,7 @@ const form = ref({
   sms_template_code: '',
   sms_phones: [] as string[],
   in_app_targets: [] as string[],
+  in_app_aggregation_window: 60,
 })
 
 // 是否为编辑模式
@@ -293,6 +363,8 @@ const isEdit = computed(() => !!props.channel?.id)
 
 const severityLoading = ref(false)
 const baseSeverityLevels = ref<any[]>([])
+const userLoading = ref(false)
+const userOptions = ref<UserItem[]>([])
 
 // 获取告警级别列表（支持 keyword 搜索）
 const fetchSeverityLevels = async (keyword?: string) => {
@@ -342,6 +414,55 @@ const handleSeveritySearch = (keyword: string) => {
   }, 300)
 }
 
+const loadUserOptions = async (keyword = '') => {
+  userLoading.value = true
+  try {
+    const response = await fetchUserList({
+      page: 1,
+      size: 50,
+      keyword: keyword || undefined,
+      status: 1,
+    })
+    const raw = response.details ?? response.data
+    const list = Array.isArray(raw) ? raw : Array.isArray(raw?.data) ? raw.data : []
+    const selectedIDs = new Set(
+      form.value.in_app_targets
+        .map((target) => Number(target.replace(/^user:/, '')))
+        .filter((id) => Number.isInteger(id) && id > 0)
+    )
+    const merged = new Map<number, UserItem>()
+    selectedIDs.forEach((id) => merged.set(id, { id, name: `用户 ${id}` }))
+    list.forEach((user) => {
+      const id = Number(user.id)
+      if (Number.isInteger(id) && id > 0) merged.set(id, { ...user, id })
+    })
+    userOptions.value = Array.from(merged.values())
+  } catch (error) {
+    userOptions.value = []
+    console.error('获取用户列表失败:', error)
+  } finally {
+    userLoading.value = false
+  }
+}
+
+let userSearchTimer: ReturnType<typeof setTimeout> | null = null
+const handleUserSearch = (keyword: string) => {
+  if (userSearchTimer) clearTimeout(userSearchTimer)
+  userSearchTimer = setTimeout(() => loadUserOptions(keyword), 300)
+}
+
+const handleEmailSecurityModeChange = (mode: string) => {
+  if (mode === 'tls') {
+    form.value.email_smtp_port = 465
+    return
+  }
+  if (mode === 'starttls') {
+    form.value.email_smtp_port = 587
+    return
+  }
+  form.value.email_smtp_port = 25
+}
+
 // 处理静默时间段变化
 const handleQuietHoursChange = () => {
   if (quietHoursEnabled.value) {
@@ -378,14 +499,14 @@ watch(
           enabled: props.channel.enabled !== undefined ? props.channel.enabled : true,
           description: props.channel.description || '',
           email_smtp_host: props.channel.email_smtp_host || '',
-          email_smtp_port: props.channel.email_smtp_port ?? 25,
+          email_smtp_port: props.channel.email_smtp_port ?? 587,
           email_username: props.channel.email_username || '',
           email_password: props.channel.email_password || '',
           email_from: props.channel.email_from || '',
           email_to: parseStringArray(props.channel.email_to),
           email_cc: parseStringArray(props.channel.email_cc),
           email_bcc: parseStringArray(props.channel.email_bcc),
-          email_use_tls: props.channel.email_use_tls || false,
+          email_security_mode: props.channel.email_security_mode || 'starttls',
           sms_provider: props.channel.sms_provider || '',
           sms_access_key_id: props.channel.sms_access_key_id || '',
           sms_access_key_secret: props.channel.sms_access_key_secret || '',
@@ -393,6 +514,7 @@ watch(
           sms_template_code: props.channel.sms_template_code || '',
           sms_phones: parseStringArray(props.channel.sms_phones),
           in_app_targets: parseStringArray(props.channel.in_app_targets),
+          in_app_aggregation_window: props.channel.in_app_aggregation_window ?? 60,
         }
 
         // 解析静默时间段
@@ -424,14 +546,14 @@ watch(
           enabled: true,
           description: '',
           email_smtp_host: '',
-          email_smtp_port: 25,
+          email_smtp_port: 587,
           email_username: '',
           email_password: '',
           email_from: '',
           email_to: [],
           email_cc: [],
           email_bcc: [],
-          email_use_tls: false,
+          email_security_mode: 'starttls',
           sms_provider: '',
           sms_access_key_id: '',
           sms_access_key_secret: '',
@@ -439,6 +561,7 @@ watch(
           sms_template_code: '',
           sms_phones: [],
           in_app_targets: [],
+          in_app_aggregation_window: 60,
         }
         quietHoursEnabled.value = false
         quietHoursStart.value = '22:00'
@@ -467,15 +590,17 @@ const handleOk = async () => {
       type: form.value.type,
       config: form.value.config,
       message_template: form.value.message_template,
-      rate_limit: form.value.rate_limit,
-      rate_limit_window: form.value.rate_limit_window,
       severity_filter: Array.isArray(form.value.severity_filter) ? form.value.severity_filter.join(',') : form.value.severity_filter,
       quiet_hours: quietHoursPayload,
-      retry_times: form.value.retry_times,
-      retry_interval: form.value.retry_interval,
       enabled: form.value.enabled,
       description: form.value.description,
     }
+    if (form.value.type !== 'in_app') {
+      data.rate_limit = form.value.rate_limit
+      data.rate_limit_window = form.value.rate_limit_window
+      data.retry_times = form.value.retry_times
+      data.retry_interval = form.value.retry_interval
+    }
     appendChannelPayload(data)
 
     let res
@@ -523,7 +648,14 @@ const isMaskedSecret = (value?: string) => {
 
 const validateChannelConfig = () => {
   if (form.value.type === 'email') {
-    if (!form.value.email_smtp_host || !form.value.email_smtp_port || !form.value.email_username || !form.value.email_from || !form.value.email_to.length) {
+    if (
+      !form.value.email_smtp_host ||
+      !form.value.email_smtp_port ||
+      !form.value.email_username ||
+      !form.value.email_from ||
+      !form.value.email_to.length ||
+      !form.value.email_security_mode
+    ) {
       return '请补齐邮件渠道必填字段'
     }
     if (!form.value.email_password) return '请输入 SMTP 密码/授权码'
@@ -540,8 +672,11 @@ const validateChannelConfig = () => {
     }
     if (!form.value.sms_access_key_secret) return '请输入 AccessKey Secret'
   }
-  if (form.value.type === 'in_app' && !form.value.in_app_targets.length) {
-    return '请至少配置一个站内消息目标'
+  if (form.value.type === 'in_app') {
+    if (!form.value.in_app_targets.length) return '请至少配置一个站内消息目标'
+    if (form.value.in_app_aggregation_window < 10 || form.value.in_app_aggregation_window > 3600) {
+      return '同告警聚合窗口须在 10～3600 秒之间'
+    }
   }
   return ''
 }
@@ -558,7 +693,7 @@ const appendChannelPayload = (data: any) => {
     data.email_to = form.value.email_to
     data.email_cc = form.value.email_cc
     data.email_bcc = form.value.email_bcc
-    data.email_use_tls = form.value.email_use_tls
+    data.email_security_mode = form.value.email_security_mode
   }
   if (form.value.type === 'sms') {
     data.sms_provider = form.value.sms_provider
@@ -572,6 +707,7 @@ const appendChannelPayload = (data: any) => {
   }
   if (form.value.type === 'in_app') {
     data.in_app_targets = form.value.in_app_targets
+    data.in_app_aggregation_window = form.value.in_app_aggregation_window
   }
 }
 
@@ -589,6 +725,13 @@ const handleVisibleChange = (visible: boolean) => {
 onMounted(() => {
   fetchSeverityLevels()
 })
+
+watch(
+  () => form.value.type,
+  (type) => {
+    if (type === 'in_app') loadUserOptions()
+  }
+)
 </script>
 
 <script lang="ts">
@@ -597,4 +740,77 @@ export default {
 }
 </script>
 
-<style scoped lang="less"></style>
+<style scoped lang="less">
+.template-label {
+  display: inline-flex;
+  gap: 6px;
+  align-items: center;
+}
+
+.template-help-icon {
+  font-size: 14px;
+  color: var(--color-text-3);
+  cursor: help;
+
+  &:hover {
+    color: rgb(var(--primary-6));
+  }
+}
+
+.template-help-panel {
+  width: 460px;
+}
+
+.template-help-header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  margin-bottom: 10px;
+
+  span {
+    font-size: 12px;
+    color: var(--color-text-3);
+  }
+}
+
+.template-help-table {
+  width: 100%;
+  overflow: hidden;
+  border: 1px solid var(--color-border-2);
+  border-spacing: 0;
+  border-collapse: separate;
+  border-radius: 4px;
+
+  th,
+  td {
+    padding: 6px 12px;
+    text-align: left;
+    border-bottom: 1px solid var(--color-border-2);
+  }
+
+  th {
+    font-weight: 500;
+    color: var(--color-text-2);
+    background: var(--color-fill-2);
+  }
+
+  tbody tr:nth-child(even) {
+    background: var(--color-fill-1);
+  }
+
+  tbody tr:last-child td {
+    border-bottom: 0;
+  }
+
+  th:first-child,
+  td:first-child {
+    width: 68%;
+    border-right: 1px solid var(--color-border-2);
+  }
+
+  code {
+    font-family: Consolas, 'Courier New', monospace;
+    color: rgb(var(--primary-6));
+  }
+}
+</style>