The discourse-doctor tool can send a test email. This should also be added to the discourse-setup tool. Do a quick email test to verify that the SMTP data that the user entered works BEFORE setting up the whole software stack. As the notes state, it will be inoperative if email isn’t setup right.
This could save a lot of time if the person doing the installation typed even on piece of data in incorrectly.
Discuss this on our forum.