[Mailman-Users] Attachment problem

[Iris Chan]

I am using a hosting company whose offers Mailman mailing list as part of their cPanel interface. I created a mailing list but have been encountering problems with attachments. The mail message goes through but attachments are always scrubbed not only at the recipient message level but also in the list archives. How can that be fixed? 
I am a technical dummy and because Mailman is the default mailing list offered in the web interface, I can't change codes, only options in the list admin interface.

Thanks
Iris