Email Problem

Hello there,
I have installed the latest version of Dolphin
If e mails are sent contain no subject
and in the header is the following


MIME-Version: 1.0 From: = UTF-8 B Rmxhc2h0eXBlLmRl = X Brightmail tracker:???? AAAAASW4HZY = X Brightmail tracker: AAAAAA ==

did the mistake have found the mail server to Postfix Installs now goes there
it was the mail server Qmail preset