resent-to possibly gets a message through moderation?

Hello.
I am running several mailing lists using mailman. Latest available debian package.
A member of one of my mailing lists got a spam message (it was confirmed on several levels).
We are not yet exactly sure how it happened, but the result was him re-sending the message to the list, carbon-copied from the spam.
Here is what I suspect caused mailman to accept the message without moderation, even though the FROM: address is not subscribed:
Resent-To: mylist@mybox.mydomain From: "inquisitorRobbins" <widowhoodCorbett@coachdriverswithen.com> Resent-Message-Id: <MC6-F1009x0j1TsvfcJ00092c47@coachdriverswithen.com> Resent-From: "member name" <member@email.address>
If it isn't it and I completely mis-understood what happened, or you require any further information to find out how mailman let this email through, please let me know. I am somewhat worried.
Thank you for your help,
Gadi Evron.
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Gadi Evron