From 98f5061754fcf5d42b9df96bc54778bddf7ae112 Mon Sep 17 00:00:00 2001
From: iMaeGoo <mail1st@qq.com>
Date: Thu, 5 Sep 2024 16:31:26 +0800
Subject: [PATCH] doc: add warning for hugging

---
 docs/backend.md | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/docs/backend.md b/docs/backend.md
index a01763f1f..77ac9b2b9 100644
--- a/docs/backend.md
+++ b/docs/backend.md
@@ -175,6 +175,10 @@ Netlify 免费等级（Functions Level 0）支持每月 125,000 请求次数和
 
 ## Hugging Face 部署
 
+::: warning 注意
+Hugging Face 部署的环境，由于默认的邮件端口被屏蔽，无法使用邮件功能。详见 [twikoo/issues/638](https://github.com/twikoojs/twikoo/issues/638)
+:::
+
 1. 申请 [MongoDB Atlas](./mongodb-atlas.md) 账号，获取 MongoDB 连接字符串
 2. 申请 [Hugging Face](https://huggingface.co/join) 账号
 3. 登录，点击 Spaces - Create new Space