Technically it's possible, yes.  However, I don't agree that spammers 
don't use ESMTP.  I think this feature would not have the effect you want.

Also, qmail does support ESMTP, even without patches.

-- Sam Clippinger

J-P Raymond wrote:
> Question,
>  
> Would it be difficult/possible to add a feature to graylist only non 
> ESMTP hosts ?
>  
> I know qmail is not esmtp but most spammer don't use esmtp so no need to 
> graylist them !
>  
> Le me know !
> 
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