Hello Alessandro,

Here is what I think may be wrong, this line here:

mail_spool_directory = /home/mail #inserito da Piatti in data 16/5/06

You can't put comments at the end of the string like you can in a shell script.
It would need to be done like this:

# inserito da Piatti in data 16/5/06
mail_spool_directory = /home/mail


--
Greg