Sender different from domain

Hi,
Our phplist installation is hosted on server1.
But we would like to send from an e-mail adres from server2.
So we set it up like this:
server12

when I create a campaign i see:
afbeelding

so I expect a mail from sender@server1.nl

But instead I get mail from sender but with the email adres from Person in charge of this system (one email address).

How can I send a mail with a sender from the name of our server for email?
Do we have to use smtp?
(by asking this I feel I’m starting to understand what’s happening).

Peter-sdl

As excepted setting up smtp solved this.