Blocking top-level domains

Mogens Melander mogens at
Sat Jul 19 06:38:16 IST 2014


I'm doing stuff like that in sendmail's access (/etc/mail/access)
file, with entries like:    ERROR:"550 Reject : - Spam source"

Works like a charm :)

On Fri, July 18, 2014 19:47, Bryan Laurila wrote:
> 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.
> Thanks!
> Bryan S. Laurila
> Senior Network Support Analyst
> Dickinson County Healthcare System
> 1721 South Stephenson Avenue
> Iron Mountain, Michigan 49801

Mogens Melander
+66 8701 33224

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