Any Way to Plug This Hole in Local Sendmail Delivery?

[RW]

On Thu, 5 Apr 2007 13:18:33 -0500
Jeffrey Goldberg <jeffrey at goldmark.org> wrote:

> The second is that the spammer could be forging in the sender
> address (envelope FROM)
> 
>    MAIL FROM:<user at 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.