diff --git a/packages/ui/certd-server/src/modules/cname/service/cname-record-service.ts b/packages/ui/certd-server/src/modules/cname/service/cname-record-service.ts
index fbfb7fb3..b72baca2 100644
--- a/packages/ui/certd-server/src/modules/cname/service/cname-record-service.ts
+++ b/packages/ui/certd-server/src/modules/cname/service/cname-record-service.ts
@@ -93,7 +93,7 @@ export class CnameRecordService extends BaseService<CnameRecordEntity> {
 
     const cnameKey = utils.id.simpleNanoId();
     const safeDomain = param.domain.replaceAll('.', '-');
-    param.recordValue = `${safeDomain}.${cnameKey}.${cnameProvider.domain}`;
+    param.recordValue = `${safeDomain}-${cnameKey}.${cnameProvider.domain}`;
   }
 
   async update(param: any) {
diff --git a/packages/ui/certd-server/src/plugins/plugin-notification/email/index.ts b/packages/ui/certd-server/src/plugins/plugin-notification/email/index.ts
index a01c1a4a..ee9478b0 100644
--- a/packages/ui/certd-server/src/plugins/plugin-notification/email/index.ts
+++ b/packages/ui/certd-server/src/plugins/plugin-notification/email/index.ts
@@ -15,7 +15,7 @@ export class EmailNotification extends BaseNotification {
       open: false,
     },
     required: true,
-    helper: '可以填写多个，填写一个按回车键再填写下一个',
+    helper: '可以填写多个，填写一个按回车键再填写下一个\n需要先[配置邮件服务器](#/sys/settings/email)',
   })
   receivers!: string[];