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[SLUG] Sendmail Check for forged From headers

Hi All

Can anyone point me to a How-To or any other documentation to explain
how to implement the above?

In simple terms, what I want to do for the domain mydomain.com is to
check incoming (external) mail and reject it if it purports to come from

I suppose the alternative is to reject incoming mail claiming to be from
mydomain.com that is not being sent from the mailservers of mydomain.com.

Hope this makes sense.

Thanks and Rgds