[Mailman-Users] Missing Re:s in replies

[Rodeo Red]

I'm using mailman with a web interface. I don't have access to the
installation files.

I set up mailman and it was working fine then it started stripping out
the Re: in the replies. 

a subject posted as:  Re:widgits
becomes: widgits

I probably changed something but I don't know what would have done that.
How do I get my Re:s back 
?
Also I don't see anyway to allow the user to include the text they are
replying to in theri repliues ? Is this possible with mailman ? 

-Red