On Tue, 4 Apr 2000, Matthias Oertli wrote:
> The question: How can I make sure people can't use someone else's
> email address by changing their email client settings?
>
> The windows mail client sends whatever address it was set up to use
> and if that is an existing account on the mailserver, it relays it.
Well, sending mail, it simply uses the address you specify and "too bad"
if somebody has it, or what have you. They will only be able to retrieve
mail from their account though (requires password).
As far as blocking this, well.. You'd need some way to match addresses to
machines. Well, there is a Received line. Okay, so you could patch your
sendmail config to look at the headers and say "If it's from this then the
Received should be from this, otherwise bounce". Well.. that could be
done :) I haven't answered your question, but I've opened it up for some
more discussion by somebody who knows more about Sendmail header stuffz.
Andrew.
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