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Normally when I see a question asking for a "tuto" (which already shows a certain attitude towards correctness) about installing such sensitive and security critical system as an MTA, I actively make the decision not to respond, at least not with any sort of content.
I just cannot understand how somebody having so little knowledge so as to ask for a "tuto" would even consider asking in a *debian* forum, as if somehow it depended on which linux distribution one uses.
So all I can recommend it: DON'T DO IT.
The world thanks you already in advance.
