diff --git a/apps/smtp-server/src/server.ts b/apps/smtp-server/src/server.ts
index da6f966..ac9af7b 100644
--- a/apps/smtp-server/src/server.ts
+++ b/apps/smtp-server/src/server.ts
@@ -27,10 +27,10 @@ async function sendEmailToUnsend(emailData: any, apiKey: string) {
     });
 
     if (!response.ok) {
-      const errorData = await response.json();
+      const errorData = await response.text();
       console.error("Unsend API error response:", errorData);
       throw new Error(
-        `Failed to send email: ${errorData.error.message || "Unknown error from server"}`
+        `Failed to send email: ${errorData || "Unknown error from server"}`
       );
     }