I have a question. We have a Service Node which roles are: "Apache web server / Postfix mail server" We have a separate Service Node which sole function is Postfix mail server. I would prefer that my Apache servers are just plain Apache servers, instead of mail nodes as well. Of course at the same time all my Apache websites must be able to send e-mail. The question is: Does my Apache server really have to be a Postfix mail server? Or will it know how to handle SMTP out?