From owner-freebsd-questions@FreeBSD.ORG  Fri Apr  6 01:14:43 2007
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Date: Fri, 6 Apr 2007 02:14:32 +0100
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Subject: Re: Any Way to Plug This Hole in Local Sendmail Delivery?
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On Thu, 5 Apr 2007 13:18:33 -0500
Jeffrey Goldberg <jeffrey@goldmark.org> wrote:

> The second is that the spammer could be forging in the sender
> address (envelope FROM)
> 
>    MAIL FROM:<user@your.domain>
> 
> The third type of forgery is in the header From address.

Bear in mind that both of these are often done legitimately; for
example by people working from home and using their ISP's server to
send an email to a colleague.