> On Jan 15, 2019, at 5:21 PM, Stephen Farrell <stephen.farr...@cs.tcd.ie> 
> wrote:
> 
> Well, not until you get to ESNI and fingerprinting different
> handshake instances as a way to track a message down a chain
> of MTAs.

This is mail, not HTTP.  If you get to read the resulting
headers, the trace headers are all there.  So whatever your
concern was, it seems rather moot.

-- 
        Viktor.

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