Scalability of 'spam.whitelist.rules' facility

[Julian Field]

Quentin Campbell wrote:
>> -----Original Message-----
>> From: mailscanner-bounces at lists.mailscanner.info [mailto:mailscanner-
>> bounces at lists.mailscanner.info] On Behalf Of Julian Field
>> Sent: 21 May 2007 15:40
>> To: MailScanner discussion
>> Subject: Re: Scalability of 'spam.whitelist.rules' facility
>>
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>>
>> [snip]
>>     
> Julian wrote:
>   
>> I would not advise more than about 1,000 entries in a ruleset. If you
>> are doing more, then far better to have a little Custom Function that
>> slurps in a db file at start time (and every "Restart Every" period)
>>     
> and
>   
>> just does a quick hash table lookup for each message. This would be
>> hugely faster. If you set
>>    Restart Every = 3600
>> then it will re-read the whitelist every hour, which is probably
>> frequent enough for most people most of the time, and makes it dead
>>     
> easy
>   
>> to implement.
>>
>> The only restriction would be that each whitelist entry was a complete
>> email address or complete domain name. Also, would they all be "From"
>> rules? Is that okay?
>>
>>     
> Julian
>
> Thanks for the helpful suggestion. I hope I have the skills to implement
> it!  
>
> The bulk of the whitelist rules entries are 'From:' complete addresses. 
>
> However there are some regular expressions and some To: addresses as
> well in the whitelist rules file.
>
> I suppose there is no reason why I cannot combine your Custom Function
> and db approach for the complete addresses _and_ leave a stub
> spam.whitelist.rules file containing the remaining handful of regular
> expressions and To: addresses?
>
>   
You can call a ruleset from within a Custom Function. I documented how 
to do this in the mailing list archive, and there should now be an 
example of it in the CustomFunctions directory.
> Quentin
>   

Jules

-- 
Julian Field MEng CITP
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