[MM3-users] Disabling max_message_size and send_welcome/goodbye_msg globally or by API

Hello,

is it possible to turn off max_message_size and send_welcome_msg / send_goodbye_msg globally?

If there are no global options, how can I turn off these feature using the REST API? In python you can do it with >>> mlist.max_message_size = 0. If I send a PATCH request to lists/some@list/config with body max_message_size=0, I get "Unknown attribute". Same for send_welcome_msg and send_goodbye_msg.

Thank you! P.M.