Hola, eh intentado enviar un correo con un script camuflado en un pdf, con una de las herramientas del social engineer toolkit, al pedir el password da error

No creo que sea el password lo he intentado con otros correos y pass diferentes, backtrack R2

Enter your choice: 1
Enter your GMAIL email address: user@gmail.com
Enter your password for gmail (it will not be displayed back to you):
(552, '5.7.0 Our system detected an illegal attachment on your message. Plea se\n5.7.0 visit http://mail.google.com/support/bin/a...py?answer=6590 to\ n5.7.0 review our attachment guidelines. u3sm1971793yba.4')
(8, 'EOF occurred in violation of protocol')

It appears your password was incorrect.

ya lo habra detectado google? ?