[Mimedefang] Blocking Dictionary Attacks

Les Mikesell les at futuresource.com
Tue Jun 9 11:28:05 EDT 2009

Matt Garretson wrote:
> afo cliff wrote:
>> Thanks for the info.  It mentions using the -t flag ... however, I
>> start mimedefang with "service mimedefang start" so I don't have any
>> control over the flags that are being used.  
> It sounds like you have Fedora or a Redhat variant?  There should
> be /etc/sysconfig/mimedefang which you can edit as you like.

But, if you have defined everyone in virtusertable with default rejects, 
sendmail will process invalid recipients faster than mimedefang can. 
You might still get a few instances where where a message comes in with 
a large number of invalid recipients that makes it obvious spam but it 
will still be accepted for a small number of valid addresses.  You might 
be able to figure that out with some work in filter_recipient - or just 
hope that your other checks catch it.

   Les Mikesell
     lesmikesell at gmail.com

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