various MTA's add "Received: ... for <adress(_at_)local(_dot_)domain>" headers
to
incoming emails (postfix only does that with mails that come from an
external sender, not sure about sendmail). if an external sender sends a
mail To: email1@ and Cc: email2@, then the copy for email2@ would not
contain "Received: ... for ... email1@" - using the Received:-header (if
you have them) for your recipes might be easier?
my 2 cents.
regards,
wolfgang
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