[MM3-users] Re: Any known cases of "non-members" who aren't explicitly allowed to send to the list with a default rule of "discard" on a list getting through?

On 1/9/26 12:16 PM, Thomas Ward via Mailman-users wrote:

We just noticed an oddness in a client's system.

Someone sent to a members-only list and it 'got past' moderation controls.  The list is set to not allow non-members to send to the list, but somehow it got through the default rule of "discard (no notification)" for a non-member and got to the list.

There are two possibilities here. Either the sender's non-member record has a moderation action of accept or default processing, or even though the From: address is a non-member, one of the envelope from or the Sender: or Reply-To: headers is a member. See the mailman.email.message.Message.senders method at https://gitlab.com/mailman/mailman/-/blob/master/src/mailman/email/message.p....

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