Well I'll try not to top post and unleash the dogs! :)

> However I couldn't find any description of a 
> successful implementation with a similar setup than ours -- I 
> would guess at least a few other companies must follow the same model.

I'm in the process of going live with the standard:

[firewall]--[SA Gateway (DMZ)]--[exchange]


> I received many replies to my previous post from people who 
> work in companies having implemented SA, but none of them do 
> the blocking at the gateway level, they give the choice to 
> the users. With our infrastructure, we cannot do that, as the 
> SA server will not know anything about the mailboxes, it 
> would just be a relay, no local /var/spool/mail directory, no 
> local /home/xxx directory for the users !

I use aliases to separate procmail files per user. This way I can customize
settings without having real users. I can completely turn on/off SA and have
separate or global white/black lists. (Thanks to Tony Svanstrom!)

I also thought that this setup must be widely used and it should be easy to
find documentation. However that wasn't the case. I have not found a simple
document that describes how to configure this setup. I thought it would have
been a FAQ :)

I also used the extended access list from
http://basic.wirehub.nl/spamstats.html to block spam at SA gateway to save
traffic. (Sorry Theo, this list was better then yours LOL!) This is a great
replacement from relying on flacky RBL servers. One day I'll write a script
that automates the process :)

> I think most companies are afraid of implementing opensource 

You let them know? LOL We secretly replace their server and they can't taste
the difference :)

> I am desperate to get SA implemented (I just love it!!) but 
> we wouldn't like to reinvent the wheel if someone else did a 
> similar implementation

Again, that was my thoughts exactly. But I never found the _one_ document.
Not only having to sift thru different kinds of installs, (Postfix,
sendmail, qmail,...) but different techniques for personal/business
installs. Quite confusing. 

I'm still trying to hide info about my exchange server from being inserted
into the header of outgoing email, but that's a different problem and some
have given me things to try already.

The people on this list have been *extremely* helpful and patient with me :)
I can't thank them enough. 
 
> I appreciate this is a very long email (apologies), if this 
> post has got nothing to do with this mailing list, I am more 
> than happy to carry the discussion off it with anyone who 
> feels they are in the same position as me, as my company.
> 
> Best Regards,
> Stephane

 I'd be glad to tell you how I stumbled thru this off list if you want more
detail :)

Chris


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