3.2.4.2 Compression Processing

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The DRS Protocol Extensions for SMTP SHOULD perform the following data compression procedure on the Send-Message-Serialized-Data byte stream. When compressing, the extension MUST compress the sequence of bytes comprising the Send-Message-Serialized-Data byte stream according to the DRS compression algorithm indicated by the value of the Send-Compression-Algorithm working variable. <12>

DecompressMessage (as specified in [MS-DRSR] section 4.1.10.6.19) specifies the relationship between compressed and uncompressed data for the DRS compression algorithms by detailing the processing steps for decompression. After the data is compressed, the result is the Send-Message-Compressed-Data byte stream.