Date: Thu, 5 Apr 2007 23:44:14 -0500 From: Jeffrey Goldberg <jeffrey@goldmark.org> To: RW <fbsd06@mlists.homeunix.com> Cc: freebsd-questions@freebsd.org Subject: Re: Any Way to Plug This Hole in Local Sendmail Delivery? Message-ID: <509ACF78-14C3-4066-B120-F02292D7AE96@goldmark.org> In-Reply-To: <20070406021432.0f4a17b4@gumby.homeunix.com> References: <200704041313.l34DDWuF044355@dc.cis.okstate.edu> <70AB9490-12D7-462A-815E-2212F977624E@goldmark.org> <20070406021432.0f4a17b4@gumby.homeunix.com>
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On Apr 5, 2007, at 8:14 PM, RW wrote: > 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. Yes. If you set up something like this it is important to provide an SMTP submission service. This allows your off-site users to use your mail server by authenticating with it. -j
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