Allowing the Mode Z Command
Mode Z compression compresses files on the fly for file transfers, saving bandwidth and improving transfer times. The client must also support MODE Z to take advantage of this feature. If MODE Z is enabled, EFT will listen for MODE Z requests, then enable it for subsequent transfers from the client that requested it.
To allow a client to use Mode Z compression
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                                                            Select the Allow MODE Z Compression check box. 
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                                                            Click OK to close the FTP Settings dialog box. 
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                                                            Click Apply to save the changes on EFT.