[Mailman-Users] Applying contradicting posting permissions at the same time

Hello,

I want to setup a mailing list with following properties:

All emails with explicit non-members with moderation option “Default Processing” are distrubuted to the mailing list. Emails from members are rejected. As example m@example.org is a member, and n@example.org is a non-member with Default processing moderation. An email

From: m@example.org Sender: n@example.org

shall be distributed, because n@example.org is а non-member, who can post. In my configuration however, the email is rejected, because m@example.org is a member and members may not post.

Is it possible to configure a MM3 mailing list, which accepts the above email, but would reject it, if the Sender: header is missing?

Greetings Дилян