On Tue, 24 Nov 2009, Alexey Melnikov wrote:
>
> Please let me know if you know of implementations (MTAs/MDAs) that generate
> such parameters (in particular ESMTPA/ESMTPS/ESMTPSA/LMTPA/LMTPS/LMTPSA)

Exim, since version 4.42 released on 2004-08-27.

> and clients that parse Received headers and analyze/check the
> corresponding WITH parameter values.

SpamAssassin uses them to detect message submission hops.

Tony.
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