The Attachment Blocking Rule allows you to filter messages according to the attachment sent with the message. This option scans the file name, extension, and MIME type. It does not scan the attachment content.
· If you use only the file name and extension (MIME is set to none), eManager will only filter according to the specific flie name. You can choose two options: Case-sensitive comparison and Exact match.
· If you use only the MIME type (name and extension fields are empty), eManager will block all emails of the specified MIME type. You can choose image, audio, or video from the drop-down list, or type in a different MIME type, such as text/plain or binary. You cannot choose multiple MIME types.
· If you choose both file name and MIME type, eManager will review both file name and MIME type before taking an action.
Spam often comes with attachments of a different MIME type than ordinarily sent by most businesses. By specifying MIME type, you can block audio, video, or image files while allowing other types to pass. This option can be used instead of blocking by size, which can inadvertently block large business-related document files.
See also:
Adding or Editing Spam Filter Rules
Exact Match and Case Sensitive Comparison Examples