An integer value that sets the minimum size in bytes that a message body must have before it is compressed. The minimum value for compression threshold is 256. The highest level for compression threshold is 32764. If a value is set beyond the specified range, then, the value that is closest to the range is used. If a value greater than 32764 or less than 256 is used, then, the size of the message is set to 32764 or 256 bytes respectively.