A problem with the sendmail

[Manuel Gonzales <agonza@xxxxxxxxxxxxxxxxx>]

Hello folks,
Last week, I receive a reply from my mailer deamon when i try to send a
mal to a list.
Somebody knows what this could happen?

Subject:  Returned mail: Can't create output: Executable files not
allowed

The original message was received at Fri, 1 Oct 1999 18:47:18 -0500
(GMT-0500)
from atenea.bvl.com.pe [200.37.10.19]

   ----- The following addresses had permanent fatal errors -----
/usr/mail/soporte
    (expanded from: :include:/local/etc/listas/soporte)

Thank in advance for you comments

Manuel Gonzales