Scusate ma questa è la parte principale della mail che mi arriva :
Hi. This is the qmail-send program at test.local.
I'm afraid I wasn't able to deliver your message to the following addresses.
This is a permanent error; I've given up. Sorry it didn't work out.
<supporto@prova.com>:
xxx.xxx.xxx.xxx does not like recipient.
Remote host said: 550-Verification failed for <anonymous@test.local>
550-The mail server could not deliver mail to anonymous@test.local. The account or
domain may not exist, they may be blacklisted, or missing the proper dns entries.
550 Sender verify failed
Giving up on xxx.xxx.xxx.xxx .

????