denying email from your own domain but external IP's?
ugob at CAMO-ROUTE.COM
Fri Jul 1 18:23:04 IST 2005
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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.
Forwarded by Ugo for Steve:
Check out this "clams to be us sendmail test which blocks email on bad
We just installed this test at a site that was getting hammered with
spam and viruses from email addresses pretending to be from their
domain. It stopped these attacks cold.
steve at fsl.com
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