Discussion List Archive scrubbing HTML => unreadable

Is there any way to stop the discussion list archive from scrubbing emails, leaving them in a format full of visible HTML tags?

The email come through to recipients nicely, but the archive is unusable.

Apparently the whole email is considered an attachment, so there’s nothing to see in the archive but this “An HTML attachment was scrubbed…” followed by a a link to an HTML mess that no one can read.

Thank you for any help.