regarding my question here: remote smtp with local failover I need to setup two exim on the same server, both listening on localhost. I evaluated using nullmailer and exim, but Debian wont allow to have both installed, i also feel that two exim instances should use less memory than one copy of exim and one of nullmailer.
Is this possible? i know postfix has instances, but im unable to find this kind of functionality on exim. The setup should receive mails from localhost (php) and attempt to use mandrill (like a smart host) and in case is not reachable try sending over the local exim running on a different port