[Mailman-Users] Controlling out going messages & Disabling "who <password>"

Short of modifying Mailman's delivery code which would probably just
result in Mailman's message delivery becoming hoplessly backlogged,
there's no way to do this in Mailman.

What you have to do is negotiate with Yahoo, Google, etc. To accept
your list mail. If you can convince them that your list traffic is
legitimate, you may succeed in getting your lists whitelisted.

On the other hand, if the issue is not the number of total recipients,
but rather the number of recipients per SMTP transaction, you can set
SMTP_MAX_RCPTS in mm_cfg.py. This controls the maximum number of
recipients in one SMTP transaction.


Assuming you want to disable this for list members as opposed to
someone authenticating with the list password, set Privacy
options...->Subscription rules->private_roster to "List admin only".