The FQDN can be easily implemented on the mail gateway, such as 
postfix.  The HELO requirement is optional.

Jim Wright wrote:
> On Jun 10, 2008, at 7:23 PM, Hugo Monteiro wrote:
>
>> Recently i've been receiving quite a lot of spam, from different  
>> places,
>> with a common denominator. The helo presented by the connecting  
>> "server"
>> is in the form of SPK<number>.localdomain. This is most likely  
>> caused by
>> infected workstations, although i am using greylisting also.
>>
>> I was wondering if i used a wildcard like %.localdomain, in the
>> blacklist_helo table, my policyd v1 server would take care of  
>> business.
>
> A better solution would be to not accept mail from systems without a  
> FQDN, that doesn't work for everyone, but eliminates a huge amount of  
> spam.  Legitimate servers can always be whitelisted.
>
> Jim
>

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