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From: Jeffrey Goldberg <jeffrey@goldmark.org>
Date: Thu, 5 Apr 2007 23:44:14 -0500
To: RW <fbsd06@mlists.homeunix.com>
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Cc: freebsd-questions@freebsd.org
Subject: Re: Any Way to Plug This Hole in Local Sendmail Delivery?
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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