I finally got another chance to look at this, and I did get the email settings to work correctly. I’m still having trouble setting up SSL, though, and I’m not sure why. I literally make one change:
# Change
mattermost_external_url 'http://chat.mywebsite.com'
# To
mattermost_external_url 'https://chat.mywebsite.com'
And Nginx then refuses to start. No idea why this would be. Any suggestions?