Update app.py

app.py

@@ -63,6 +63,9 @@ def send_email(to_email, subject, body):
         
         logging.info(f"Email sent to {to_email}")
         return True
+    except smtplib.SMTPAuthenticationError as auth_error:
+        logging.error(f"SMTP Authentication Error: {auth_error}")
+        raise Exception(f"Failed to send email: Invalid credentials or app-specific password required.")
     except Exception as e:
         logging.error(f"Email error: {e}")
         raise Exception(f"Failed to send email: {str(e)}")