also sprach Matthew Palmer <mpalmer@debian.org> [2005.06.20.0252 +0200]:
> I'd be impressed if your ISP can rewrite the Received: header
> produced by the hop after them to change the IP address of their
> SMTP server into your IP address.
That's really not difficult, and it's being done. Remember: the ISP
is in the unique position to forge the sender IP -- both ways. I've
seen several software that *fails* to add Received headers.
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