Why is MS doing spam checks first?

Julian Field MailScanner at ecs.soton.ac.uk
Sat Dec 3 18:54:39 GMT 2005

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Remco Barendse wrote:

>> Do you have a local caching name server running on that box? If not 
>> you ought to run one. Bind is really quite easy to set up to cache 
>> only (The instructions are in /etc/named/named.conf or similar). Try 
>> increasing the child processes one at a time until you reach the best 
>> you can. My old (Well OK ancient!) 450Mz P3 with 128Mb of ram will 
>> run 2 processes without swapping (With a maximum batch size of 25) 
>> and Bind so you box should manage more than it is. Have a look in the 
>> wiki as there are some good optimisation tips in there that will help.
> Thanks for the tip!
> Yes I do have my own caching nameserver running but as soon as I set 
> the number of processes higher than 2 I start getting SA timeouts. 
> With only 2 I don't get any timeouts and everything is filtered as it 
> should.

Why does it start timing out? Is it virtual memory and swapping? "vmstat 
5" will show large pi+po or si+so swapping figures if that's the case. 
It's worth researching why it is timing out. Also try switching on + off 
particular features such as DCC and Razor, to see if that makes a 
difference. At the moment I'm having all sorts of nasty DCC problems so 
have had to drop all use of it.

> I don't know why SA is so slow. Whenever there has been an outage and 
> there are several thousands of messages waiting SA seems to take hours 
> to process one batch of let's say 30 messages or so.

Research why SA is going so slow.

- -- 
Julian Field
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