Attachments cannot be attached to email sent to the Discussion List. If you receive an attachment from the Discussion List, ASRM strongly suggests that you delete it as it could be a virus. It is the responsibility of the individual Discussion List members to install and update anti-virus software on their computers which are used to send and receive Discussion List posts.
As an alternative to attachments, if you wish to have a file made available to all members of the List, you can email the file to the ASRM Web Site Manager (firstname.lastname@example.org) and it will be placed on the Discussion List's Files page. You can then announce to the List the addition of the file to the Files page.