[Mailman-Users] Help with 'The message has no valid senders'

We recently installed Mailman 3 to replace an existing Mailman 2 installation with a large number of lists and users. I'm now seeing a number of users on specific lists whose posts result in: May 18 14:25:41 2021 (112570) DISCARD: ; ['The message has no valid senders'] The post have sender a

[Mailman-Users] Re: Help with 'The message has no valid senders'

On 5/18/21 4:14 PM, McGuire, Tommy M. (MSFC-IS90)[EAST2] via Mailman-Users wrote: > We recently installed Mailman 3 to replace an existing Mailman 2 installation > with a large number of lists and users. I'm now seeing a number of users on > specific lists whose posts result in: > > May 18 14:2