I find out that our country (slovakia) has lack of experience in mailing systems. There is no one who to ask and no discussion forums too.

I can do it on Forums like daniweb and other foreign sites. The problem is that the network in our country is not the same in functionality and in security too.
So there are things which has to be done in different way. This is what I want to find out here.

First question:

Do I need smarthosting?? (sendmail - what is it at all??)