Session-level compression will get ~99% compression for the 2nd to nth
message in a bulk mailing. Apart from that CDAT and stream compression
should be the same.
CDAT could get the same compression if you don't reset the compressor
between messages in the session. With deflate that's trivial, just
skip the call to the initialization routine after the first message.
Also, how many MTAs reuse sessions these days? I have no idea, our
friends at Yahoo and Goog probably have useful numbers.
R's,
John
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