Normally you can only use port 25 for the SMTP server of the ISP you are
connected through.  Most email providers have another port and
authentication method for when you are connected to a different ISP.

www.aruba.it and www.tiscali.it are Italian ISPs.

Italy is in the Central European Time Zone (GMT + 1 hour).  Your message
headers indicate that your computer is in the Pacific Time Zone (GMT - 8
hours).  This suggests that you are not in Italy - so you are probably
using a different ISP to access the internet.

Many mail providers will not allow you to use their outgoing (smtp) mail
servers, if you have connected to the internet via a different ISP.

Some smtp mail servers require authentication for outgoing messages.

Not surprisingly, the Tiscali Italia and Aruba Italia websites are in
Italian.  However, I don't speak Italian - so I don't know whether the
Tiscali or Aruba websites include any help pages.

Some ISPs block access to other SMTP mail servers while connected via
them.  (They block TCP/IP port 25 except to their own SMTP mail server.)
Some of these ISPs will make exceptions if you present a compelling
reason to do this.  The error messages may indicate network is
unreachable, access denied, or timeout errors (socket errors 10051,
10061 and 10060.)  Another workaround for this is to use the SMTP mail
server of the service that you connect via, but leave your other
settings the same.  In some cases you can use Port 587 or 465 rather
than port 25 (specify in OE at Tools, Accounts, Mail, Properties,
Advanced).  Your ISP is more likely to allow this port.  The SMTP mail
server has to support this port.  SMTP Authentication will likely be
required.  In OE this is specified in Tools, Accounts, Mail, Properties,
Servers, Outgoing Mail Server, My Server Requires Authentication.

Windows Vista Mail Newsgroup:
news://msnews.microsoft.com/microsoft.public.windows.vista.mail

You can also get to the newsgroup via this web site:
http://www.microsoft.com/communities/newsgroups/default.mspx
There select Windows Vista, then Windows Mail.

In MSN Discussion newsgroup, you said you're running Windows Live Mail,
Constantino.  You'll find support for Windows Live Mail (WLM) in this public
newsgroup: microsoft.public.windows.live.mail.desktop

Via the web-interface:
http://www.microsoft.com/communities/newsgroups/list/en-us/default.aspx?dg=micro
soft.public.windows.live.mail.desktop

Via your newsreader:
news://msnews.microsoft.com/microsoft.public.windows.live.mail.desktop

If, however, you're running Windows Mail (the default Mail Client in Vista),
you'll find support in this public newsgroup:
microsoft.public.windows.vista.mail

Via the web-interface:
http://www.microsoft.com/communities/newsgroups/list/en-us/default.aspx?dg=micro
soft.public.windows.vista.mail

Via your newsreader:
news://msnews.microsoft.com/microsoft.public.windows.vista.mail