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Old 07-28-2016, 08:20 PM   #1
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Registered: Sep 2015
Location: Brisbane, Australia
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postfix - how do I drop emails from external sources to a specific address.

We have a problem where the email address root@<my.domain> has some how got onto a list that spammers like to send their emails to.

we have an alias to re-direct root@<my.domain> to our unix team's email address so everyone has been getting these emails.

What I want to know is if it is possible to block all emails sent to root@<my.domain> unless it comes from one of our servers.

That is, there is no case when that email address should ever be used by an external party, so I would like to drop all emails to that address that our servers haven't sent.

SNMP relay is running postfix, amavis and clamav.
Old 07-29-2016, 03:01 AM   #2
Registered: Oct 2012
Distribution: OpenSuSE,RHEL,Fedora,OpenBSD
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The suggestions there are easily passed by address spoofing.

Adding this to .procmailrc for the end recipient should help.
* ^Received: from.*unknown


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