denying email from your own domain but external IP's?

[Ugo Bellavance]

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Matt Kehler wrote:
> I'd like to toss all email if the 'from' address is of my own domain
> (xyz.com), and it does NOT originate from my internal 192.168.1.0/24
> network.  Can I do this with MailScanner?  Or can I even do it with
> Sendmail itself instead?  
> 
> Basically in our environment, people can use our internal mail client
> while at work, or they can use our webmail, but thats IT.  (ie, no
> Outlook express clients at home :).  So essentially anything with the
> 'from' as xyz.com and NOT using our internal IP addressing would have to
> be forged.
> 
> thanks
> Matt
> 

And this is how I manage it

http://wiki.mailscanner.info/doku.php?id=documentation:anti_spam:spf:install:sendmail:spfmilter

Plus spf DNS records.

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