I was going to sign up for aweber but it says it is only in english. A couple of questions:

I would think I can customize the emails so they are all in italian. I have never used the service, I guess the only problem would be if people unsubscribe or try to manage their subscriptions.

Is there another service that has a language option? I checked constant contact and a couple of others but they don't talk about other languages.

The main reason I would do it is to increase the chances the newsletter hit the inbox. I am using phplist right now and for example, hotmail always sends it to the spam folder. I would think it will not happen with one of the hosted services, although who knows about other italian ISPs.