A Custom Media Type is a list of one or more hexadecimal signatures that can identify a sequence of bytes in a specific position within a file. The position is defined by the offset from either the start or end of the file. It defines a list of hexadecimal signatures that Clearswift Gateway looks for when the list is referenced from a Which Media Types clause in the What To Look For? section of a content rule.
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| Custom Media Type detection only applies to attachments that would otherwise have been classified as Unknown Binary. It cannot be used to override the built-in recognition for all the media types that are supported by the Gateways. |