A file name filter extracts an attachment's file name using the email's MIME headers and applies a decision based on the file name filter settings.
Go to Filtering > Attachments and select the File Name Filters tab.
Select Create and the Create A Filename Pattern Filter window displays.
Filename Pattern: Use the asterisk sign (*) to match zero or more characters; use the question mark sign (?) to match a single character. For instance, to filter all executable attachments that include the word sample, create a filter *sample*.exe.
Inbound action: Select the action to take on inbound emails that match this filter:
Allow: Allow the email.
Block: Block the email.
The domain or user policy determines if the message is quarantined. Go to Policies > Domain Policy or User Policies.
Ignore: Take no action.
Scan Archives: Select if you want this filter to match files contained within compressed archive files.
Comments (optional): Enter optional comments about this file name filter.
Select Create or save this extension filter or Cancel to discard changes.