The Attachment is "name or extension" criteria allows you to create rules that take actions on messages based on the name or extension of attachments that a message contains. If a message contains a compressed attachment, this criteria can further match the name or extension of the files included in the compressed attachment.
The Attachment Names screen appears.
The "recommended" category contains those whose file types commonly act as containers for malware and are not types that are normally exchanged via email in an organization. This list includes extensions such as COM, DLL, and EXE. The commonly exchanged category includes file types that are commonly sent between members of an organization.
The latter list includes the DOC extension used by Microsoft Word documents. These files are often used to propagate VB macro viruses, but they are also often commonly exchanged within organizations.
The following examples are valid:
doc or *.doc
docx or *.docx
doc* or *.doc*
The file name is added to the list just below.
If there are any names in the list that you want to delete, select them and click Delete.