New domains sending spam

Johnson, SE sjohnson at
Thu Apr 14 18:23:36 IST 2011

I've been seeing a lot of new domains pop up and immediately start sending spam.

In our environment we will almost never get an email from someone on a brand new domain.  

Is there a way to not accept an email from a domain that is say less than 30 days old?

Environment ->MailScanner, Spamassassin, Postfix


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