修复邮件系统: 1.处理收件人为None的情况 2.增强SMTP服务器对空收件人的检查

app/services/mail_store.py

@@ -84,7 +84,13 @@ class MailStore:
             try:
                 # 查找收件人对应的邮箱
                 mailbox_id = None
-                recipients_list = recipients if isinstance(recipients, list) else [recipients]
+                
+                # 处理recipients为None的情况
+                if recipients is None:
+                    logging.warning("收件人列表为None，将使用空列表")
+                    recipients_list = []
+                else:
+                    recipients_list = recipients if isinstance(recipients, list) else [recipients]
                 
                 # 确保收件人列表不为空
                 if not recipients_list: