Hello! Is it possible to send email using the Postfix provided /usr/sbin/sendmail command on a system where Postfix is installed, but not running permanently as a service?
Background: I have a resource constrained system where I want to avoid running excess processes, and it rarely sends email. When it sends, it just relays to a proper Postfix host accessible on the local network. There is no incoming nor local mail delivery needs on that system. I have been using msmtp for this need, but its handling of multiple recipients in the same mail is too simple and I'd rather use Postfix that parses and validates recipients properly. In my testing the command sendmail on a system where Postfix is installed does accept the email but it puts it in a local queue (verified by mailq) and then the queue just sits still and no mail is delivered. Manually running postflush complains that Postfix is not running. If I quickly cycle 'postfix start' and 'postfix stop' the service starts and sends out the queue and everything works, but ideally I'd like an invocation of /usr/sbin/sendmail to immediately send off the email to the relay host and not depend on a permanently running Postfix daemon. Is this possible? I've tested the -G and -q options mentioned at http://www.postfix.org/sendmail.1.html but they don't seem to do this what I was looking for.
