I've installed NodeBB on a Ubuntu machine hosted on AWS.
I can't send a test email from the configuration page. I keep getting the error "Spawn sendmail ENOENT". I've tried to configure the "Gmail Router" setting, putting in my gmail account details with no success. I've tried to use the nodebb-plugin-emailer-amazon typing in my my public and secret SES Keys but that didn't work as well. The error message is always the same: "Spawn sendmail ENOENT".
I'm a total beginner when it comes to NodeBB, so I don't even know where to start looking in order to debug that error. Any help will be much appreciated.