Blocking top-level domains

Bryan Laurila Bryan.Laurila at
Fri Jul 18 18:47:29 IST 2014

I had an interesting situation creep up on me this week where I thought
that something was happening (or being processed) in
MailScanner/SpamAssassin but apparently it was not.

I have two mail relay scanners running MailScanner & SpamAssassin on
Suse Linux.  These boxes scan incoming mail for spam & viruses and then
relay to my MS Exchange server.  I had an influx of spam this week
coming in from several top-level domains that we wouldn't normally
receive any valid emails from anyway, like .eu, .in, .asia, .club, etc.

Upon investigating the situation I found that the Trend Micro Scan Mail
service on my Exchange server crashed which lead me to the discovery
that MailScanner & SpamAssassin weren't filtering mail from these
unwanted top level domains as I thought and all that work was being done
by my exchange server.

So, the question of the day is...  Where is the best place to turn on
filtering or set a rule somehow to filter unwanted top-level domains at
the MailScanner/SpamAssassin servers?

Like all things in IT there are probably multiple ways of doing this so
I am curious as to what others are doing.  All thoughts & comments are


Bryan S. Laurila
Senior Network Support Analyst
Dickinson County Healthcare System
1721 South Stephenson Avenue
Iron Mountain, Michigan 49801

"Life begins at the end of your comfort zone!"

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Dickinson County Healthcare System, 1721 S. Stephenson Ave. Iron Mountain, MI 49801,
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