[Mailman-Users] Non-member posting to the list

[Rodrigo Abrantes Antunes]

Hi, I was configuring a server with Joomla and AcyMailing to send mass
emails and then I realized that if I configure the sender address as being
one of a non moderated user it could send a message to a list without the
non moderated user knows. How can I avoid that? Isn't there any
configuration in mailman that prevents messages with forged from headers to
be posted to the list?

  Thanks.