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On Apr 14, 2008, at 8:07 AM, Ian Eiloart wrote:
> --On 12 April 2008 11:18:09 -0400 Barry Warsaw <[EMAIL PROTECTED]> wrote:
>>
>> So you mean that most SMTPd's will have accepted the message by  
>> they time
>> they issue the DATA to the LMTP?
>
> Exim will have, almost certainly.

Okay.  BTW, wouldn't you think that the majority of messages sent to a  
Mailman list will have exactly one RCPT?  Cross-posting is relatively  
rare for most sites, isn't it?
>
>> If that's the case, then does it even
>> make sense to do content filtering at that step in LMTP, given that  
>> we'll
>> still be doing the full-blown rule matching in the incoming runner?
>
> It's of very limited use. I'm not convinced that my users use it at  
> all. If a message passes the sender filter, then it's probably OK to  
> generate a bounce message. The exception would be for an open list,  
> but an open list that gets lots of spam probably isn't going to last  
> very long.
>
> My view is that content filtering for spam belongs in the MTA, which  
> is much better equipped to deal with it. Rejecting spam at SMTP time  
> has the huge advantage that spambots can learn to leave you alone. I  
> don't know if they do, though. Otherwise, you can teergrube them  
> (add delays to the smtp replies, to slow them down).

I agree.  Okay, let's code for the common/useful case and leave the  
rest for YAGNI.

- -Barry

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