On  3 Jun 98 at 10:05, Lou Schwing wrote:

> >> ...reason: mail origin is listed in the "Filter=" list header...
>
> Do you use the * Filter= keyword in your list header?  If so, check and see
> if there is something about their mail domain that matches.

Another possibility is that it's referring to the default filters,
and the sender address is one of the no-no addresses, such as
postmaster or daemon, or something similar.

Francoise