Blocking top-level domains
Bryan Laurila <Bryan.Laurila <at> dchs.org>
2014-07-18 17:47:29 GMT
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 welcome.
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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