[CentOS] postfix and mail origin checks

RedShift wrote:
> Karanbir Singh wrote:
> > Whats the 'robust' way to make sure email to a specific destination
> > is only accepted if it came over the localhost:25 or
> > /usr/sbin/sendmail route ? anything else should get a 5xx error.
> > Emails to other destinations should remain unaffected.
> > 
> > Using postfix/c4. Had a look around, and header_checks might be one
> > way to go.
> > 
> 
> The easiest way is probably to edit master.cf and make smtpd only
> listen on localhost:25.

Ummm. The question was "how to *identify* mails coming from localhost",
not "restrict everything to localhost".

> Otherwise us an access table.

I'd be curious how you would do that.

Ralph
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