Redmine

I've no idea what I'm doing wrong, but my email setup isn't functioning as it should. Sending test emails works fine, but actions like sending account information or email notifications doesn't. I've tried with both mailgun and smtp2go, and when I say that it doesn't work, I mean that the SMTP server is never contacted at all. I switched to using sidekick as the email queue per the docs, but maybe that's outdated/broken? Should I use the default? Did I screw up somewhere?

There also aren't any error messages in the logs or displayed on the page. The queue engine notes that the message was queued in sidekick but that's it. Nothing else is in the logs about it.