diff --git a/mail-worker/src/service/ai-service.js b/mail-worker/src/service/ai-service.js
index 93b86a4..ec13736 100644
--- a/mail-worker/src/service/ai-service.js
+++ b/mail-worker/src/service/ai-service.js
@@ -1,8 +1,6 @@
 import emailUtils from '../utils/email-utils';
 import { settingConst } from '../const/entity-const';
 
-const codeKeywords = ['码', '令牌', 'code', 'token'];
-
 const aiService = {
 	async extractCode(c, email, options = {}) {
 		if (!this.shouldExtractCode(options.aiCode, options.aiCodeFilter, email)) {
@@ -60,19 +58,14 @@ const aiService = {
 
 		const filterList = aiCodeFilterStr ? aiCodeFilterStr.split(',').map(item => item.trim().toLowerCase()).filter(Boolean) : [];
 
-		if (filterList.length > 0) {
-			const fromEmail = (email.from?.address || '').trim().toLowerCase();
-			const fromDomain = emailUtils.getDomain(fromEmail).toLowerCase();
-			return filterList.some(item => item === fromEmail || item === fromDomain);
+		if (filterList.length === 0) {
+			return true;
 		}
 
-		const subject = email.subject || '';
-		const text = emailUtils.formatText(email.text || '');
-		const htmlText = emailUtils.htmlToText(email.html || '');
-		const content = `${subject}\n${htmlText || text}`;
-		const lowerContent = content.toLowerCase();
+		const fromEmail = (email.from?.address || '').trim().toLowerCase();
+		const fromDomain = emailUtils.getDomain(fromEmail).toLowerCase();
 
-		return codeKeywords.some(keyword => lowerContent.includes(keyword));
+		return filterList.some(item => item === fromEmail || item === fromDomain);
 	}
 };