- listen on loopback for no-mail option, fixes #8

lib/os/class.ISPConfigDebianOS.inc.php

@@ -599,6 +599,12 @@ mailman-unsubscribe:  "|/var/lib/mailman/mail/mailman unsubscribe mailman"';
 				'dovecot-lmtpd'
 			);
 			$this->installPackages($packages);
+		} else {
+			$cmd = 'postconf -e "inet_interfaces = loopback-only"';
+			$result = $this->exec($cmd);
+			if($result === false) {
+				ISPConfigLog::warn('Command ' . $cmd . ' failed.', true);
+			}
 		}