[CentOS-docs] Short postgrey guide?

[Ned Slider]

Alain Reguera Delgado wrote:
> On 12/17/07, Ned Slider <nedslider at f2s.com> wrote:
>> Hi Guys,
> ...
> 
> Could we add the following image:
> http://wiki.centos.org/HowTos/postgrey?action=AttachFile&do=get&target=postgrey-en.png
> 
> I found the article very clear and easy to read. I would like to thank
> you with this image, if it helps of course. If some modification is
> needed, tell me please, I will be glad to fix it.
> 
> Cheers,
> al.

Thanks Alain - nice image and explains the concept well.

Any objections to adding it from anyone?