[hashcash] Exchange mucking with the headers

I've come to the knowledge that Exchange is mucking with the mail headers,
stripping out any duplicate fields. This is troublesome for me, as sending
a mail to multiple recipients, means minting many Hashcash tokens, and
placing each token in the header with "X-Hashcash". There may be more than
one present. However, Exchange changes "X-Hashcash" to "x-hashcash", and
removes any dupe "x-hashcash" fields.

I could stamp each mail upon delivery, rather than mail creation, but that
would meach changing the way I handle SMTP with Mutt, and that's not
something I'm really interested in persuing. AFAIK, there is no "standard"
against duplicate header fields, so my multiple "X-Hashcash" tokens should
be just fine.

Has anyone else noticed this? Is there a server-side setting on Exchange
that prevents Exchange from mucking with the headers?

Thanks,

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