In most spam blocking software, you can input types ( and even exact file names ) to block. Just block any file called "message.zip" I have tested this and it works at least on our NEMX system Chs This transmission is intended only for the use of the addressee and may contain information that is privileged, confidential, and exempt from disclosure under applicable law. If you are not the intended recipient, or the employee or agent responsible for delivering the message to the intended recipient, you are hereby notified that any dissemination, distribution, or copying of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately via e-mail at: Privacy@xxxxxxxxxxx