Question : I recieved an email from someone: how can i see from server who sent it?

Reply-To: [email protected]
Message-Id: <20100722151411.954B73F461@juani.solunatec.org>
Date: Thu, 22 Jul 2010 11:14:11 -0400 (EDT)

Hello World!

This is my first mail.

...i recieved this email: it came through my freebsd server: I am running:: postfix: squirrelmail::courierimap

Answer : I recieved an email from someone: how can i see from server who sent it?

What email client are you using?  If you can view the raw headers, they will show you a path that the message took starting from the senders PC.