[Mailman-Users] How to get rid of text attachments

[Matthew Ricketts]

I am new to Mailman. I am trying it out and I am doing some simple tests. I
have made a list of two of my own email addresses. When ever I send an email
to the list, it seems to work except I get a text attachment that has the
name of the list email and the url for the list.
 
How can I prevent this from being attached to the emails that get
distributed?
 
Thanks.