diff --git a/Architecture-Server.md b/Architecture-Server.md
index 027d13c..4d4ff93 100644
--- a/Architecture-Server.md
+++ b/Architecture-Server.md
@@ -214,15 +214,11 @@ flowchart TD
     Merge --> Filter[Filter by: not deleted,<br/>within date range,<br/>not expired]
     Filter --> Response[Return to client]
 
-    Client -->|claim_mail_reward| CW{
-[Back to top](#top)
----
-
-## Mail/Inbox System
-
-```mermaid
-flowchart TD
-    Admin[Admin RPC] -->|admin_send_mail| Global[Global Mail<br/>config/global_mail<br/>system user]
+    Client -->|claim_mail_reward| CW{Check claimed_ids}
+    CW -->|Already claimed| Err[error: Reward already claimed]
+    CW -->|Not claimed| Grant[Grant rewards:<br/>gold/star -> wallet<br/>fragments -> fragment storage<br/>skins -> inventory storage]
+    Grant --> UpdateState[Update state:<br/>add mailId to claimed_ids]
+```[Global Mail<br/>config/global_mail<br/>system user]
     Admin -->|admin_send_mail<br/>with target_user_id| Personal[Personal Mail<br/>inbox/personal<br/>per user]
 
     Client -->|get_mail| Merge[Merge global + personal]