diff --git a/core/frontend/src/messages-page.css b/core/frontend/src/messages-page.css
index 74f55c2..65cd968 100644
--- a/core/frontend/src/messages-page.css
+++ b/core/frontend/src/messages-page.css
@@ -219,10 +219,12 @@
   color: var(--black-alpha-56);
   font-size: 12px;
   line-height: 1.55;
+  /* 收件箱副文案:超出一行即省略号截断,不换行撑破行高对齐(UI 反馈:文字太长换行后与 UI 框错位) */
   display: -webkit-box;
-  -webkit-line-clamp: 2;
+  -webkit-line-clamp: 1;
   -webkit-box-orient: vertical;
   overflow: hidden;
+  word-break: break-all;
 }
 .msg-item-foot {
   display: flex;