diff --git a/app/setting_interface.py b/app/setting_interface.py
index a7a750fad..308c6a9bf 100644
--- a/app/setting_interface.py
+++ b/app/setting_interface.py
@@ -1468,6 +1468,7 @@ def __initCard(self):
                     "ssl": {"title": tr("启用 SSL"), "description": tr("可选参数，是否启用 SSL"), "type": "bool"},
                     "starttls": {"title": tr("启用 STARTTLS"), "description": tr("可选参数，是否启用 STARTTLS"), "type": "bool"},
                     "ssl_unverified": {"title": tr("跳过证书验证"), "description": tr("可选参数，是否跳过 SSL 证书验证"), "type": "bool"},
+                    "plain_text": {"title": tr("纯文本模式"), "description": tr("可选参数，是否以纯文本格式发送邮件（适用于 Outlook 等邮箱）"), "type": "bool"},
                 },
                 "tutorial": """
 <h4>一、什么是 SMTP？</h4>
diff --git a/assets/config/config.example.yaml b/assets/config/config.example.yaml
index 7c53f8be3..685f8a484 100644
--- a/assets/config/config.example.yaml
+++ b/assets/config/config.example.yaml
@@ -556,6 +556,7 @@ notify_smtp_port: "" # SMTP 服务器端口，默认为 465。
 notify_smtp_ssl: true # 是否使用 SSL 连接 SMTP 服务器。默认为 True，可设置为 False 关闭。
 notify_smtp_starttls: false # 是否使用 SSL 连接 SMTP 服务器。默认为 False，可设置为 True 关闭。
 notify_smtp_ssl_unverified: false # 是否使用不经验证的 SSL 连接。默认为 False，可设置为 True 关闭。除非您使用自签名邮箱,否则不推荐启用。
+notify_smtp_plain_text: false # 是否以纯文本格式发送邮件。默认为 False（发送 HTML 格式）。true 开启后将以纯文本发送，适用于 Outlook 等将 HTML 邮件作为附件处理的邮箱。
 
 # OneBot 通知配置（QQ 机器人）
 # 已测试 NapCatQQ(https://github.com/NapNeko/NapCatQQ) 和 OpenShamrock(https://github.com/whitechi73/OpenShamrock) 可用
diff --git a/module/notification/smtp.py b/module/notification/smtp.py
index d8239e41b..36bb3a98e 100644
--- a/module/notification/smtp.py
+++ b/module/notification/smtp.py
@@ -21,21 +21,29 @@ def send(self, title: str, content: str, image_io=None):
         ssl = self.params.get("ssl", True)
         starttls = self.params.get("starttls", False)
         ssl_unverified = self.params.get("ssl_unverified", False)
+        plain_text = self.params.get("plain_text", False)
 
-
-        msg = MIMEMultipart('related')
-        body = f'<p>{content}<br>'
-        if image_io:
-            body += '<img src="cid:image1">'
-        body += '</br></p>'
-        msg['Subject'] = Header(title, 'utf-8')
-        msg['From'] = From
-        msg['To'] = To
-        if image_io:
-            img = MIMEImage(image_io.getvalue())
-            img.add_header('Content-ID', '<image1>')
-            msg.attach(img)
-        msg.attach(MIMEText(body, "html", "utf-8"))
+        if plain_text:
+            if image_io:
+                self.logger.warning("SMTP 纯文本模式下不支持发送图片，图片将被忽略")
+            msg = MIMEText(content, "plain", "utf-8")
+            msg['Subject'] = Header(title, 'utf-8')
+            msg['From'] = From
+            msg['To'] = To
+        else:
+            msg = MIMEMultipart('related')
+            body = f'<p>{content}<br>'
+            if image_io:
+                body += '<img src="cid:image1">'
+            body += '</br></p>'
+            msg['Subject'] = Header(title, 'utf-8')
+            msg['From'] = From
+            msg['To'] = To
+            if image_io:
+                img = MIMEImage(image_io.getvalue())
+                img.add_header('Content-ID', '<image1>')
+                msg.attach(img)
+            msg.attach(MIMEText(body, "html", "utf-8"))
 
         if starttls:
             smtp = smtplib.SMTP(host, port)