Blocking top-level domains

[Bryan Laurila]

I like this but I forgot to mention in my original post that I am
running postfix.  How would I configure something like this using
postfix?

Thanks,
   Bryan

Bryan S. Laurila
Senior Network Support Analyst
Dickinson County Healthcare System

-----Original Message-----
From: mailscanner-bounces at lists.mailscanner.info
[mailto:mailscanner-bounces at lists.mailscanner.info] On Behalf Of Mogens
Melander
Sent: Saturday, July 19, 2014 12:38 AM
To: mailscanner at lists.mailscanner.info
Subject: Re: Blocking top-level domains

Hi

I'm doing stuff like that in sendmail's access (/etc/mail/access) file,
with entries like:

cn.ru    ERROR:"550 Reject : cn.ru - 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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