On Feb 8, 2008, at 11:37 AM, Leonardo Rodrigues Magalhães wrote:

> Lately i have seen a LOT of SPAM resending with almost exact 10  
> minutes of difference. For example:
>
> Feb  3 07:51:06 hermes policyd: rcpt=876, greylist=new,  
> host=117.6.120.63 (unknown), [EMAIL PROTECTED], [EMAIL PROTECTED] 
> , size=33567

snip

> Feb  2 11:06:40 hermes policyd: rcpt=1121, greylist=update,  
> host=121.174.102.112 (unknown), [EMAIL PROTECTED], [EMAIL PROTECTED] 
> , size=0
>
>
>   just to quote some few examples of 'almost exact 10 minutes'  
> resending connections.
>
>   Have you seen, greylist users, experiencing these spammers  
> retrying as well ?? Seems it's time to raise the default  
> TRIPLET_TIME to 15m .....

There is a common theme there, you are accepting mail from servers  
without FQDNs, hence the 'unknown'.  Fix your server, and they won't  
bother you again.


Jim
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