How to remove "Title:" from messages

How can i remove this line that keeps appearing at the top of my 
messages ?
<address>Title: <strong>dev-mailinglist test</strong></address>

I have near enough cracked MhonArc but this i am failing at miserably.

You can see my test mailing list in action at 
http://www.exousialinux.org/mailing-lists/
thanx

Justine Smithies