app-smtp was installed using market place.

Package 1:app-smtp-2.2.1-1.v7.noarch already installed and latest version

@Dirk, that is the template file copied in by the install routine, /usr/clearos/apps/smtp/deploy/install, to overwrite /etc/postfix/main.cf. In /usr/clearos/apps/mail_routing/deploy/install, it ges set to "all" on-the-fly. I suspect the mail_routing app also gets installed when you install the SMTP Server app.

Hmm. Mine defaults to "all" so I've never had to change it.

You need to install the app-smtp app for the default configuration to take effect otherwise the default is for security purposes...just to allow local services from mailing out via Postfix.

B

Same thing here... only localhost was allowed to send mail. Googled a lot and the only solution I found was to edit /etc/postfix/main.cf manually. It should be able to set inet_interfaces via Webconfig.

You can - or at least the system can for you. If you are trying to use ClearOS as a mail server, install the Mail Server app from the marketplace. It will do this for you.

You sure you don't wanna be looking in /usr/clearos/apps/smtp/deploy/main.cf? Mine shows "all" in /etc/postfix/main.cf, but it shows "localhost" in /usr/clearos/apps/smtp/deploy/main.cf. I think the latter is what the Marketplace's mail server app would be using.