Comment 24 for bug 832660

Did like #16: I had

[Agent]
Online=false

in .config/akonadi/agent_config_akonadi_maildispatcher_agent

I toggled it to true and restarted akonadi, then my waiting mail was sent.

It could have something to do with going back from sleep. This time, the last return from sleep did not go well (freeze) and I had to force the power down and start the system again.
Maybe going to sleep is supposed to toggle Online to false and waking up toggle it back to true, which did not work in my case, since my computer did not technically wake up from sleep.