py-mailqueued

py-mailqueued is an ansynchronous daemon for sending or queueing mail, depending on the state of the network. It's primary advantage is that it always sends mail immediately if the network is up, and queues only if the network is down.

It currently only supports using NetworkManager over dbus to query the network status. This has the advantage that most Linux desktop/laptop setups use NetworkManager and dbus, and isn't bound to silly tricks like pinging (which make be blocked by a proxy or firewall) or resolving a hostname (which is not guaranteed to work). It also means that the daemon switches modes as soon as NetworkManager switches to or from full network access. The downside is of course that NetworkManager must be managing all of your network interfaces.

Usage

This package requires systemd to run. You're welcome to use it without systemd, but I'm not intrested in supporting any other init system. Sorry.

This package also requires that you use NetworkManager. This should cover most systems that realistically need a mail-queueing daemon. I might take patches to support other clients if they have dbus interfaces.

This first thing you'll need to do is enable the daemon:

systemctl --user daemon-reload
systemctl --user start mailqueued
systemctl --user enable mailqueued

Once that's done add 'mail-queue' to the front of your normal mailer command (tested with msmtp):

/bin/mail-queue /bin/msmtp --account=myaccount -t

And that's it. Mail will be sent when generated if the network is up, and queued when it is not