Consider usual ML's which allows post from registered members. For example, sales 1, 2 and 3 division. Create sales-1, sales-2 and sales-3 ML. Each division manages each member list. Also, create sales ML other than that to inform the whole sales members. If you send a mail to sales ML, the mail is sent to all members of sales-1, sales-2 and sales-3 ML. Define the following $recipient_maps in the config.cf of sales ML. recipient_maps += $ml_home_dir/../sales-1/recipients recipient_maps += $ml_home_dir/../sales-2/recipients recipient_maps += $ml_home_dir/../sales-3/recipients Define $member_maps in the same way to allow post from all sales members: member_maps += $ml_home_dir/../sales-1/members member_maps += $ml_home_dir/../sales-2/members member_maps += $ml_home_dir/../sales-3/members Instead of $member_maps change, it is simple that you allow post from anybody. If so set article_post_restrictions = permit_anyone This example is simplest. It is easy to use this style. If you need to use SQL e.g. MySQL, it is modern. It needs a lot of preparions and operation know-how.