BTW I would be thankful for good explanation which RFC recommendation 
are broken by redirecting "suspected spam" to /dev/null for quoting in 
messages to postmaster of such sites.
[ May be there is a time to create new category on www.rfc-ignorant.org
]
And I'd like a good explanation of how you'd detect that behavior.
 
* In one case I detected it by non email communication  (phone: Why have 
not you replied to my email ?)
* In another case the recipient have not received the message itself but 
received replies ("reply to all") to the message sent by other 
recipients of the original message.
In both cases I checked the MTA logs and it was clear that another MTA 
"took over" FULL responsibility for delivering the messages.
But what if the "recipient" was (gasp) lying?
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