You can download deepOfix Mail Server (Version 3.3) from here.

 The md5sum of the deepOfix Mail Server

YOu can check the md5sum of the deepOfix Mail Server that you have downloaded and compare it with the below given md5sum. If both match, then the iso that you have downloaded is not corrupted.

4579865873502b7dc88ad0e8e9a88b73