1)   [Status: DOMAIN_NOT_RESOLVED, Address: <'xxxx@xxxxxxx.com'>]

       Message will be retried for 4 more day(s)

2) Every time I try to send an e-mail to a "tiscali.it" e-mail account, I receive the following error:

 A message that you sent could not be delivered to one or more of its recipients. This is a permanent error.

 'amministrazione@olbiacalcio.com' DOMAIN_NOT_RESOLVED