[Mailman-Users] Footer shows as a txt attachment instead of appended in body

[Joe Mezzanini]

I have a mailman discussion group with some text
in the "Footer added to mail sent to regular list members "

However, some mail software does not show that added text.

Specifically, Outlook has it as a file attachment AT000001.txt instead of
appending it to the body of the email.

Anyone know how to “fix” this?  thanks