Am 10.11.2011 12:56, schrieb Gabriele Gabriele:
> for example:
> if some one send one e-mail from internet to one user that non exist on my 
> domain

you have to reject mail for non-existent users and the sending server
is repsonsible for bounces in this case, what you are doing is backscattering
for every spam-mail with faked senders and will get you blacklisted sooner
or later



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