diff --git a/EnvelopeGenerator.ReceiverUI/Services/AuthService.cs b/EnvelopeGenerator.ReceiverUI/Services/AuthService.cs
index c0b020dd..4fa759ee 100644
--- a/EnvelopeGenerator.ReceiverUI/Services/AuthService.cs
+++ b/EnvelopeGenerator.ReceiverUI/Services/AuthService.cs
@@ -78,4 +78,16 @@ public class AuthService(HttpClient http, IOptions<ApiOptions> apiOptions)
             _ => SenderLoginResult.Error
         };
     }
+
+    /// <summary>
+    /// Logs out the sender user by removing the authentication cookie.
+    /// Calls POST /api/auth/logout.
+    /// </summary>
+    public async Task<bool> LogoutSenderAsync(CancellationToken cancel = default)
+    {
+        var response = await http.PostAsync(
+            $"{_api.BaseUrl}/api/auth/logout",
+            null, cancel);
+        return response.IsSuccessStatusCode;
+    }
 }