Being hammered with viruses

Michael Huntley michael at
Tue Apr 25 17:33:51 UTC 2017

Danita - 

In postscreen do you have any rbls? 

This should help: 

postscreen_dnsbl_sites =,,
postscreen_dnsbl_action = enforce
postscreen_greet_action = enforce

Keeping it simple.  Zen stops a huge amount of spam. 

You can also use deep analysis with postscreen which closes the
connection forcing senders to reconnect or use a greylist daemon. 

Peter's ideas in the other email to you are viable as well. 



On 2017-04-25 09:05, Danita Zanre wrote:

> I have one site that I scan for that is just being inundated with spam and viruses.  My poor server simply cannot keep up!  We are right now getting hammered with viruses, for example.  I need to figure out how to tweak this a bit.  I could add more memory/CPU, but first I want to see if there are things I can do first to make the system run better. 
> 1.  I think I should stop sending email messages to ME when viruses happen, but I can't figure out what's sending me those.  I also use Mailwatch, in case it's involved. 
> 2.  Can I make some changes to postscreen that will make it drop more of these connections?  I'm pretty much just using "defaults". 
> 3.  I don't think in Postfix you can limit inbound connections really.  The other email system I work with for my corporate email allows you to choose how many inbound threads and how many outbound threads.  It's our policy to always have twice as many outbound threads as inbound so that we can handle these kind of load systems.  I'm accepting so much more JUNK than I have time to throw away.  Especially with #1 above, where I'm getting sent thousands of virus notices ;-) 
> I appreciate any pointers here!  Thanks. 
> DANITA ZANRÈ, _Move Out of the Office_ 
> I love my job, and you can too! 
> Tel: (720) 319-7530 - Caledonia.Net [1] LLC 
> Tel: (720) 319-8240 - Move Out of the Office

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