Mark Foster wrote:
No, it is not true. Header analysis can reveal whether the relaying hosts
sequence & pattern in the Received: headers is consistent with previous
(bonafide) messages received from the sender.
Most people uses just one (or a few at most) SMTP servers for sending
their mail.
Alas this too is easily forgible. The header can only be trusted to the
extent you trust the last client SMTP host's IP address.
Harry Tabak
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