[CentOS-docs] Short postgrey guide?

Karanbir Singh wrote:
> Ned Slider wrote:
>>> Could we add the following image:
>>> http://wiki.centos.org/HowTos/postgrey?action=AttachFile&do=get&target=postgrey-en.png 
>>
>> Thanks Alain - nice image and explains the concept well.
>>
>> Any objections to adding it from anyone?
> 
> 
> Please go ahead and add it. It looks clear enough to me.

Alain - please would you add your diagram... I'm not sure how to go 
about uploading/adding a picture to a Wiki. Once I've seen how you do it 
then I'll know for future reference!

> 
> btw, I just decimated your article with loads of other info that people 
> might find interesting. All of that came from my head, so if someone can 
> technically proof read it once would be appreciated.
> 
> - KB

Nice additions - thanks!

Rereading, I did find a typo in my own earlier stuff 
/etc/postfix/mail.cf > main.cf, now fixed.

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