So, i inherited an aging Postfix machine running CentOS. When my boss sends to users@mydomain.com (to send out a mass email) she gets bouncebacks from all of the email addresses that i've added since i started. When i add the email in Webmin, it says its in the group called users. But i believe there is an extra step that i've been missing. Anyone can show me an example or give me some insight that would be greatly appreciated. Thanks.