spam avoidance (was Re: cpu speed problem)

[Tony Nelson]

At 11:25 AM +0100 7/30/07, Andy Green wrote:
 ...
>    - insist on proper Helo FQDN (lot of spam tools and viruses don't
>take care of this)
 ...

Do you require the name to be real, or only in valid form?  That is, do you
do a DNS lookup on the name?
-- 
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