diff --git a/src/frontend/src/components/MailPanel.tsx b/src/frontend/src/components/MailPanel.tsx
index 9c94352..1376d2f 100644
--- a/src/frontend/src/components/MailPanel.tsx
+++ b/src/frontend/src/components/MailPanel.tsx
@@ -193,6 +193,7 @@ export default function MailPanel() {
                   border: '1px solid var(--acc)', background: 'var(--acc)22', color: 'var(--acc)', cursor: 'pointer',
                 }}>✓ 标记已读</button>
               )}
+            {detail.status !== 'done' && (
               <button onClick={async () => {
                 await fetch(`/api/mail/${detail.id}`, {
                   method: 'PATCH', headers: { 'Content-Type': 'application/json' },
@@ -204,6 +205,7 @@ export default function MailPanel() {
                 padding: '6px 14px', borderRadius: 6, fontSize: 11,
                 border: '1px solid #2ecc8a', background: '#2ecc8a22', color: '#2ecc8a', cursor: 'pointer',
               }}>✅ 标记已执行</button>
+            )}
             </div>
           </>
         )}