Anti Spoofing Ruleset

[Sean O'Reilly]

    Hi Guys,

Am fairly new to MailScanner and would like a little help with writing a
ruleset that will stop internal mail (mail coming from our domain)
coming from an external address.

Is it possible to do something along the lines of

>From    'our domain'    !localnet    no

or have i misunderstood how rulesets work

Best regards

Sean
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