[Mailman-Users] Automate Moderator Functions

I've seen various queries on this but nothing definitive about it being added as a feature or even a customizable mod. There are certain moderator actions that potentially could be automated. For example, I would never approve a posting from a non-member of a restricted list. It would make my moderator duties much easier if I could have mailman automatically reject or discard such posts. The same might be true for exceeding the size limit. Is this something that has been considered and rejected as a feature or is it something that is doable now that I have just not been able to find? TIA.