diff --git a/app/courrier/page.tsx b/app/courrier/page.tsx
index 4dd75fe3..0efb79a0 100644
--- a/app/courrier/page.tsx
+++ b/app/courrier/page.tsx
@@ -618,8 +618,8 @@ export default function CourrierPage() {
       <main className="w-full h-screen bg-black">
         <div className="w-full h-full px-4 pt-12 pb-4">
           <div className="flex h-full bg-carnet-bg">
-            {/* Sidebar - Force display without conditions */}
-            <div className="w-60 bg-white/95 backdrop-blur-sm border-r border-gray-100 flex flex-col" style={{display: "flex !important"}}>
+            {/* Sidebar - Make sure it's visible regardless of email selection */}
+            <div className="w-60 bg-white/95 backdrop-blur-sm border-r border-gray-100 flex flex-col md:flex" style={{display: "flex !important"}}>
               {/* Courrier Title */}
               <div className="p-3 border-b border-gray-100">
                 <div className="flex items-center gap-2">
@@ -976,7 +976,7 @@ export default function CourrierPage() {
             </div>
 
             {/* Main Content Area - conditionally show email list or detail view */}
-            <div className="flex-1 flex flex-col overflow-hidden">
+            <div className="flex-1 flex flex-col overflow-hidden" style={{ maxWidth: 'calc(100% - 240px)' }}>
               {/* Header bar with search */}
               <div className="p-2 border-b border-gray-100 bg-white flex items-center justify-between">
                 <Button 
@@ -1072,7 +1072,11 @@ export default function CourrierPage() {
                 ) : selectedEmail ? (
                   <EmailDetailView 
                     email={selectedEmail} 
-                    onBack={() => handleEmailSelect('')}
+                    onBack={() => {
+                      handleEmailSelect('');
+                      // Ensure sidebar stays visible
+                      setSidebarOpen(true);
+                    }}
                     onReply={handleReply}
                     onReplyAll={handleReplyAll}
                     onForward={handleForward}